This PR implements a hack. It does effectively 2 things:
1. It checks in a set of protos, suffixed with `.intermediate` that allow the abci proto generation to proceed.
2. Adds a script / makefile to enable the generation. 

The script is pretty simple. It copies over the 'intermediate' files over to be the `.proto` files for the `abci/types.proto` file and the `types/types.proto` files, generates all the protos, and then reverts all of the changes made to the `*.proto` files and the `*.pb.go` files, except for the single abci file. 

If this is too ugly, I'm happy to tweak it, but my goal here is to have some working version of the protos that currently build the abci code so that we can coordinate changes to the code and not have them all sit in different branches that make breaking changes across each other.

The end goal is to have the `.intermediate` files disappear completely, since they should be moving towards containing everything that the `.proto` files contain.

This change adds an overview of the proposer-based timestamps algorithm. The goal of this documentation is to give a plain enough explanation of the algorithm so that application developers and validators can understand both the utility of the algorithm and understand how the new constrains may affect their network and topology. 

I'm blanking on the scheme we decided on for docs linking, so if anyone could remind me what link format we decided on, I'll go clean that up ASAP.

Once this is merged, I intend to create a runbook for chains that see slower block-times or higher nil prevotes and link that runbook to this document to provide a higher-level overview.

closes: #8046

Both pubsub and eventbus are internal packages now, and all the existing use
has been updated to use the SubscribeWithArgs methods instead.

Co-authored-by: Thane Thomson <connect@thanethomson.com>

* Changed the spec text to agreed VoteExtension solution

* Revert "Removed protobufs related to vote extensions"

This reverts commit 4566f1e302.

* Changes to ABCI protocol buffers

* Update spec/core/data_structures.md

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Update spec/core/data_structures.md

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

* Fix dangling link in ABCI++ readme

* Addressed comments

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

I believe that this gets rid of our temp-file related test errors.

This reverts commit f939f962b1.

A lot of inbound links are still broken, so we will need to find a different
approach to suppressing unreleased docs.

Since the goal of reading events at the head of the event log is to satisfy a
subscription style interface, there is no point in allowing head polling with
no wait interval. The pagination case already bypasses long polling, so the
extra option is unneessary.

Set a minimum default long-polling interval for the head case.
Add a test for minimum delay.

* Update ADR template

The reason for this proposed update to the ADR template is twofold:

1. There's currently no easy way to cross-reference between ADRs and
   issues/PRs on GitHub. This may be easy to manage for those with
   context while they're working on implementing an ADR, but after time
   passes and for complex ADRs it gets more difficult for newcomers to
   the codebase to track both the implementation status of the ADR or
   its historical context and discussions.
2. We should not allow for "proposed" ADRs. An ADR is a **decision
   record**, which implies acceptance, and not a proposal. RFCs provide
   a mechanism to make proposals.

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Add example of one ADR superseding another

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Move "Proposed" ToC entries to "Accepted".

It's possible some of these should actually be "Implemented", but I did not try
to go through each one to distinguish.

* Revert "Move "Proposed" ToC entries to "Accepted"."

This reverts commit d8d2907e98.

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Fix Markdown formatting

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Add "Deprecated" section to ADR TOC

Signed-off-by: Thane Thomson <connect@thanethomson.com>

* Expand ADR template to explicitly cater for rejected ADRs

Signed-off-by: Thane Thomson <connect@thanethomson.com>

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

Co-authored-by: M. J. Fromberger <fromberger@interchain.io>

Co-authored-by: Kukovec <jure.kukovec@gmail.com>