Optimizing blockchain reactor.

Merge master to develop

Release/0.22.5

crypto: Fix package imports from the refactor

* reconnect to self-reported address if persistent peer is inbound

* add a fixme

* update changelog

* txAvailable is always true

Refs #2021, #1920

* remove debug message

No additional value. `enterPropose` log message should be enough.

Refs #2021, #1920

The privkey.Generate method here was a custom-made method for deriving
a private key from another private key. This function is currently
not used anywhere in our codebase, and has not been reviewed enough
that it would be secure to use. This removes that method. We should
adopt the official ed25519 HD derivation once that has been standardized,
in order to fulfill this need.

closes #2000

* #1920 try to fix race condition on proposal height for published txs

- related to create_empty_blocks=false
- published height for accepted tx can be wrong (too low)
- use the actual mempool height + 1 for the proposal
- expose Height() on mempool

* #1920 add initial test for mempool.Height()

- not sure how to test the lock
- can the mutex reference be of type Locker?
-- this way, we can use a "mock" of the mutex to test triggering

* #1920 use the ConsensusState height in favor of mempool

- gets rid of indirections
- doesn't need any "+1" magic

* #1920 cosmetic

- if we use cs.Height, it's enough to evaluate right before propose

* #1920 cleanup TODO and non-needed code

* #1920 add changelog entry

* crypto/secp256k1: Add godocs, remove indirection in privkeys

The following was previously done for creating secp256k1 private keys:

First obtain privkey bytes. Then create a private key in the
underlying library, with scalar exponent equal to privKeyBytes.
(The method called was secp256k1.PrivKeyFromBytes,
fb90c334df/btcec/privkey.go (L21))

Then the private key was serialized using the underlying library, which just
returns back the bytes that comprised the scalar exponent, but padded to be
exactly 32 bytes.
fb90c334df/btcec/privkey.go (L70)

Thus the entire indirection of calling the underlying library can be avoided
by just ensuring that we pass in a 32 byte value. A test case has even be written
to show this more clearly in review.

* crypto/secp256k1: Address PR comments

Squash this commit

* crypto: Remove note about re-registering amino paths when unnecessary.

This commit should be squashed.

Revert to SetSync for saveABCIResponses() as per Ethan's feedback

crypto: Refactor to move files out of the top level directory

Add Proto files for types.Header (incl. BlockId, Time, PartsSetHeader)

make Block Header and Data non-pointers

use RWMutex for consensus state

make `/status` RPC endpoint resistant to consensus halt

This commit updates the godocs for the package, and adds an optimization
to the privkey.Pubkey() method.

The optimization is that in golang, the private key (due to interface
compatibility reasons) has a copy of the public key stored inside of it.
Therefore if this copy has already been computed, there is no need to
recompute it.

Refs #1883

Refs #1883

Refs #1772

allows multiple RPC requests to query consensus state

Refs #1772

Currently the top level directory contains basically all of the code
for the crypto package. This PR moves the crypto code into submodules
in a similar manner to what `golang/x/crypto` does. This improves code
organization.

Ref discussion: https://github.com/tendermint/tendermint/pull/1966

Closes #1956

- timestamps no longer have fixed length encoding
-

- also reformat code and order imports

Generate static marshalling methods for ABCI types to make compatible with downstream GRPC usage

Refs #1720

* Add private peer ID tracking to AddrBook

* Remove private peer tracking/blocking from pex

* debug level msg when we fail to add private address

* tools: Remove redundant grep -v vendors/

This was used in conjunction with `go list <path>`, however `go list`
already ignores the vendor directory. This made this `grep -v` redundant.

* Missed an apostrophe

Signed-off-by: Silas Davis <silas@monax.io>