Reorganizes the Protobuf schemas. It is mostly bikeshedding, so if something is contentious or causes a lot of extra work then I'm fine with reverting. Some Protobuf and Go import paths will change.

* Move `abci/types/types.proto` to `abci/types.proto`.

* Move `crypto/keys/types.proto` and `crypto/merkle/types.proto` to `crypto/keys.proto` and `crypto/proof.proto`.

* Drop the use of `msgs` in filenames, as "message" is a very overloaded term (all Protobuf types are messages, and we also have `message Message`). Use `types.proto` as a catch-all, and otherwise name files by conceptual grouping instead of message kind.

## Description

partially cleanup in preparation for errcheck

i ignored a bunch of defer errors in tests but with the update to go 1.14 we can use `t.Cleanup(func() { if err := <>; err != nil {..}}` to cover those errors, I will do this in pr number two of enabling errcheck.

ref #5059

## Description

- expand `upgrading.md`
- alphabetize the changelog
- update swagger with changes


Closes: #XXX

also,

- add an example for WS
- mention that a subscription could be terminated in /subscribe

Closes #5014

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

fix bug so that PotentialAmnesiaEvidence is being gossiped

handle inbound amnesia evidence correctly

add method to check if potential amnesia evidence is on trial

fix a bug with the height when we upgrade to amnesia evidence

change evidence to using just pointers.

More logging in the evidence module

Co-authored-by: Marko <marbar3778@yahoo.com>

## Description

have the defined abci proto types follow the same directory structure as in abci folder.

Closes: #XXX

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

Closes #4549

## Description

This PR moves all proto files under one dir (`/proto`). The script to generate adding functionality to copy the files that still need to be in the same place. (abci & rpc)

renames every proto package from `tendermint.proto.<pkg_name>` to `tendermint.<pkg_name>`

Removes unneeded types in privval proto directory

Closes: #XXX

Closes #4763

* check for Error after for loop ends

so we don't silently ignore errors, which would lead to clients getting
incomplete results

Refs https://github.com/tendermint/tendermint/pull/4979/files#r436511572

Migrates the `rpc` package to use new JSON encoder in #4955. Branched off of that PR.

Tests pass, but I haven't done any manual testing beyond that. This should be handled as part of broader 0.34 testing.

## Description

the second part of state proto migration

Closes: #XXX

## Description

try to further resolve rpc docs issue

Closes: #XXX

## Description

_Please add a description of the changes that this PR introduces and the files that
are the most critical to review._ 

Closes: #XXX

* rpc/core: return an error if `page=0`

Closes #4942

affected endpoints:

- /validators
- /tx_search

* swagger: update doc for /unconfirmed_txs

## Description

- remove keyname suffix from keys


Closes: #2228

Ethermint currently has to maintain a map height-> block hash on the store (see here) as it needs to expose the eth_getBlockByHash JSON-RPC query for Web3 compatibility. This query is currently not supported by the tendermint RPC client.

## Description

I was able to reproduce this non-determinism locally
After increasing the timeout to 8 seconds from 5 I was not able to reproduce it

Closes: #2856

Mitigates race condition causing these test failures:

```
=== RUN   TestTxEventsSentWithBroadcastTxAsync
=== RUN   TestTxEventsSentWithBroadcastTxAsync/*http.HTTP
I[2020-05-25|12:29:08.477] Starting WSEvents service                    impl=WSEvents
    TestTxEventsSentWithBroadcastTxAsync/*http.HTTP: event_test.go:124: 
        	Error Trace:	event_test.go:124
        	Error:      	Expected nil, but got: &errors.errorString{s:"timed out waiting for event"}
        	Test:       	TestTxEventsSentWithBroadcastTxAsync/*http.HTTP
        	Messages:   	0: timed out waiting for event
```

Fixes race conditions causing the following test failures:

```
=== RUN   TestUnconfirmedTxs
    TestUnconfirmedTxs: rpc_test.go:342:
                Error Trace:    rpc_test.go:342
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestUnconfirmedTxs
    TestUnconfirmedTxs: rpc_test.go:343:
                Error Trace:    rpc_test.go:343
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestUnconfirmedTxs
    TestUnconfirmedTxs: rpc_test.go:345:
                Error Trace:    rpc_test.go:345
                Error:          Not equal:
                                expected: types.Txs{types.Tx{0x39, 0x44, 0x4d, 0x6c, 0x4b, 0x66, 0x46, 0x78, 0x3d, 0x45, 0x33, 0x33, 0x68, 0x47, 0x6e, 0x79, 0x58}}
                                actual  : types.Txs(nil)

                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1,4 +1,2 @@
                                -(types.Txs) (len=1) {
                                - (types.Tx) (len=17) Tx{39444D6C4B6646783D45333368476E7958}
                                -}
                                +(types.Txs) <nil>

                Test:           TestUnconfirmedTxs
    TestUnconfirmedTxs: rpc_test.go:342:
                Error Trace:    rpc_test.go:342
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestUnconfirmedTxs
    TestUnconfirmedTxs: rpc_test.go:343:
                Error Trace:    rpc_test.go:343
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestUnconfirmedTxs
    TestUnconfirmedTxs: rpc_test.go:345:
                Error Trace:    rpc_test.go:345
                Error:          Not equal:
                                expected: types.Txs{types.Tx{0x39, 0x44, 0x4d, 0x6c, 0x4b, 0x66, 0x46, 0x78, 0x3d, 0x45, 0x33, 0x33, 0x68, 0x47, 0x6e, 0x79, 0x58}}
                                actual  : types.Txs{}

                                Diff:
                                --- Expected
                                +++ Actual
                                @@ -1,3 +1,2 @@
                                -(types.Txs) (len=1) {
                                - (types.Tx) (len=17) Tx{39444D6C4B6646783D45333368476E7958}
                                +(types.Txs) {
                                 }
                Test:           TestUnconfirmedTxs
--- FAIL: TestUnconfirmedTxs (0.20s)
=== RUN   TestNumUnconfirmedTxs
    TestNumUnconfirmedTxs: rpc_test.go:364:
                Error Trace:    rpc_test.go:364
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestNumUnconfirmedTxs
    TestNumUnconfirmedTxs: rpc_test.go:365:
                Error Trace:    rpc_test.go:365
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestNumUnconfirmedTxs
    TestNumUnconfirmedTxs: rpc_test.go:364:
                Error Trace:    rpc_test.go:364
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestNumUnconfirmedTxs
    TestNumUnconfirmedTxs: rpc_test.go:365:
                Error Trace:    rpc_test.go:365
                Error:          Not equal:
                                expected: 1
                                actual  : 0
                Test:           TestNumUnconfirmedTxs
--- FAIL: TestNumUnconfirmedTxs (0.09s)
```

Fixes the following test race condition:

```
=== RUN   TestAppCalls
    TestAppCalls: rpc_test.go:216:
                Error Trace:    rpc_test.go:216
                Error:          Expected value not to be nil.
                Test:           TestAppCalls
--- FAIL: TestAppCalls (2.20s)
```

## Description

various linitng fixes

in /validators, /consensus_params and /status

Closes #3161

## Description

remove test files for proto stubs

Closes: #XXX

Closes https://github.com/tendermint/tendermint/issues/3857

Moves `lib/` folder to `jsonrpc/`.

Renames:

**packages**

`rpc` package -> `jsonrpc` package
`rpcclient` package -> `client` package
`rpcserver` package -> `server` package

**structs and interfaces**

```
JSONRPCClient to Client
JSONRPCRequestBatch to RequestBatch
JSONRPCCaller to Caller
```

**functions**

```
StartHTTPServer to Serve
StartHTTPAndTLSServer to ServeTLS

rpc/jsonrpc/client: rename NewURIClient to NewURI

NewJSONRPCClient to New
NewJSONRPCClientWithHTTPClient to NewWithHTTPClient
NewWSClient to NewWS
```

**misc**

- unexpose `ResponseWriterWrapper`
- remove unused http_params.go

Closes #3433

Closes #4603

Commands used (VIM):

```
:args `rg -l errors.Wrap`
:argdo normal @q | update
```

where q is a macros rewriting the `errors.Wrap` to `fmt.Errorf`.

## Description

remove duplicate BlockID in swagger files

Closes: #XXX

Fixes #4802. The Go HTTP server has a global panic handler for requests, so it was not as severe as first thought.

This fix can still panic, since we try to send a `500` response - if that happens, the Go HTTP server will terminate the connection. Otherwise, the client will get a 200 response, which we should avoid. I'm sort of torn on whether it's even necessary to include this fix, instead of just letting the HTTP server deal with it.

thus enabling faster commit verification assuming non uniform distribution of power.

Closes #2478

spec: https://github.com/tendermint/spec/pull/91

Fixes #828. Adds state sync, as outlined in [ADR-053](https://github.com/tendermint/tendermint/blob/master/docs/architecture/adr-053-state-sync-prototype.md). See related PRs in Cosmos SDK (https://github.com/cosmos/cosmos-sdk/pull/5803) and Gaia (https://github.com/cosmos/gaia/pull/327).

This is split out of the previous PR #4645, and branched off of the ABCI interface in #4704. 

* Adds a new P2P reactor which exchanges snapshots with peers, and bootstraps an empty local node from remote snapshots when requested.

* Adds a new configuration section `[statesync]` that enables state sync and configures the light client. Also enables `statesync:info` logging by default.

* Integrates state sync into node startup. Does not support the v2 blockchain reactor, since it needs some reorganization to defer startup.

this pr brings over the removal of pubkey from duplicatevote evidence from proto-breakage

ref #4580

merged the existing store into pool, consolidated the three buckets into two, used block height as a marked for committed evidence, evidence list recovers on start up, improved error handling

The PR added a new field `index` to event attribute, that will cause indexer service to index the event if set to true.

Closes: #4530

This PR contains logic for both submitting an evidence by the light client (lite2 package) and receiving it on the Tendermint side (/broadcast_evidence RPC and/or EvidenceReactor#Receive). Upon receiving the ConflictingHeadersEvidence (introduced by this PR), the Tendermint validates it, then breaks it down into smaller pieces (DuplicateVoteEvidence, LunaticValidatorEvidence, PhantomValidatorEvidence, PotentialAmnesiaEvidence). Afterwards, each piece of evidence is verified against the state of the full node and added to the pool, from which it's reaped upon block creation.

* rpc/client: do not pass height param if height ptr is nil

* rpc/core: validate incoming evidence!

* only accept ConflictingHeadersEvidence if one

of the headers is committed from this full node's perspective

This simplifies the code. Plus, if there are multiple forks, we'll
likely to receive multiple ConflictingHeadersEvidence anyway.

* swap CommitSig with Vote in LunaticValidatorEvidence

Vote is needed to validate signature

* no need to embed client

http is a provider and should not be used as a client

Closes: #4695

Verify /block_results and /validators responses from an HTTP client using the light client.

Added count and total to /validators response.

Refs #3113

Add Has function, create better handling of errors when adding evidence, usage of error types.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

* Added BlockStore.DeleteBlock()

* Added initial block pruner prototype

* wip

* Added BlockStore.PruneBlocks()

* Added consensus setting for block pruning

* Added BlockStore base

* Error on replay if base does not have blocks

* Handle missing blocks when sending VoteSetMaj23Message

* Error message tweak

* Properly update blockstore state

* Error message fix again

* blockchain: ignore peer missing blocks

* Added FIXME

* Added test for block replay with truncated history

* Handle peer base in blockchain reactor

* Improved replay error handling

* Added tests for Store.PruneBlocks()

* Fix non-RPC handling of truncated block history

* Panic on missing block meta in needProofBlock()

* Updated changelog

* Handle truncated block history in RPC layer

* Added info about earliest block in /status RPC

* Reorder height and base in blockchain reactor messages

* Updated changelog

* Fix tests

* Appease linter

* Minor review fixes

* Non-empty BlockStores should always have base > 0

* Update code to assume base > 0 invariant

* Added blockstore tests for pruning to 0

* Make sure we don't prune below the current base

* Added BlockStore.Size()

* config: added retain_blocks recommendations

* Update v1 blockchain reactor to handle blockstore base

* Added state database pruning

* Propagate errors on missing validator sets

* Comment tweaks

* Improved error message

Co-Authored-By: Anton Kaliaev <anton.kalyaev@gmail.com>

* use ABCI field ResponseCommit.retain_height instead of retain-blocks config option

* remove State.RetainHeight, return value instead

* fix minor issues

* rename pruneHeights() to pruneBlocks()

* noop to fix GitHub borkage

Co-authored-by: Anton Kaliaev <anton.kalyaev@gmail.com>

* rpc/client: initial split into directories

* lite2: split out test package

* rpc/client: simplify client constructurs

* updated docs

* updated changelog

Closes: #4606