* Start of ADR

* flesh out abci events and errors adrs

* adr: move 012 to 023

* adr-022: add note from cwgoes

* md links dont work in slate

* docs: link to rpc

* docs: use unsafe_reset_all

* do not advertise unsafe_reset_priv_validator

* remove ConsensusParams.TxSize and ConsensusParams.BlockGossip

Refs #2347

* block part size is now fixed

Refs #2347

* use max data size, not max bytes for tx limit

Refs #2347

* Make mempool aware of MaxGas requirement

* update spec

* Add tests

* Switch GasWanted from kv store to persistent kv store

* Fix typo in test name

* switch back to using kvstore, not persistent kv store

also, return ErrNotStarted when trying to stop a not-running service

Fixes #2409

* Enforce file permissions in case they've changed

* test behaviour for autofile

* use testify in tests and rename `fInf` to `fileInfo`

* return an error if file permissions have changed

- if we can't read the file, we'll still panic

* get rid of "github.com/pkg/errors" dependency

* address review comments:

- prefix instead of suffix
- add state to err and construct formatting in Error() method

* address review comments:

- move error to libs/errors

* [rpc] transform /status result.node_info.other into map
* amino does not support maps, duh

Refs #2391

* update DOCS_README
* add spec to docs & other lil fixes (#2402)

Refs #1714

Why:
original fork is abandoned and not supported anymore.

Changes:
- LevelDB 1.19 (LevelDB and Snappy are both compiled and linked statically, so while you will not need them installed on your target machine, you should have a roughly compatible version of libstdc++.)
- snappy and lz4 libs included by default

Otherwise, it's impossible to see outliers
#1835 (comment)

otherwise we're benchmarking overriding single key (because hash stays
the same!)

BlockIntervalSeconds metric & DB tests cleanup & benchmark improv.

and fix formatting

Refs #2417 (comment)

This is the implementation for the design described in ADR 12[0]. It's
the first step of a larger refactor of the p2p package as tracked in
interface bundling all concerns of low-level connection handling and
isolating the rest of peer lifecycle management from the specifics of
the low-level internet protocols. Even if the swappable implementation
will never be utilised, already the isolation of conn related code in
one place will help with the reasoning about execution path and
addressation of security sensitive issues surfaced through bounty
programs and audits.

We deliberately decided to not have Peer filtering and other management
in the Transport, its sole responsibility is the translation of
connections to Peers, handing those to the caller fully setup. It's the
responsibility of the caller to reject those and or keep track. Peer
filtering will take place in the Switch and can be inspected in a the
following commit.

This changeset additionally is an exercise in clean separation of logic
and other infrastructural concerns like logging and instrumentation. By
leveraging a clean and minimal interface. How this looks can be seen in
a follow-up change.

Design #2069[2]
Refs #2067[3]
Fixes #2047[4]
Fixes #2046[5]

changes:
* describe Transport interface
* implement new default Transport: MultiplexTransport
* test MultiplexTransport with new constraints
* implement ConnSet for concurrent management of net.Conn, synchronous
to PeerSet
* implement and expose duplicate IP filter
* implemnt TransportOption for optional parametirisation

[0] https://github.com/tendermint/tendermint/blob/master/docs/architecture/adr-012-peer-transport.md
[1] #2067
[2] #2069
[3] #2067
[4] #2047
[5] #2046

We are swapping the exisiting listener implementation with the newly
introduced Transport and its default implementation MultiplexTransport,
removing a large chunk of old connection setup and handling scattered
over the Peer and Switch code. The Switch requires a Transport now and
handles externally passed Peer filters.

Fix inconsistent documents and code

Handshaker was removed from proxy package so it can be called
independently of starting the abci app connections and can return a
result to the caller.

We didn't use this code anywhere in the codebase. As such, we probably
should reduce the surface area we support. In the event that we do
in fact require 256 bit words inside of tendermint, we should adapt
the stdlibs' internal word representations, which also handles SIMD.

Inside of the SDK, a separate solution for big ints / larger words
is employed, which uses big ints. This in turn does utilize the stdlibs
SIMD support.

- remove second AminoVersion from
https://github.com/tendermint/tendermint/pull/2426/files#diff-f2fefc7a06ea0d1e0a910196901e50aaR86

Refs #2433

* Add /consensus_params endpoint
* Incorporated change #2415 (comment)
* Fixed an error in pervious commit

* readme: add some libs to semver

* changelog: some updates

* follow up to removing some consensus params Refs #2382
* change args type to int64 in state#makeParams
* make valsCount and evidenceCount ints again
* MaxEvidenceBytesPerBlock: include magic number in godoc
* [spec] creating a proposal
* test state#TxFilter
* panic if MaxDataBytes is less than 0
* fixes after review
* use amino#UvarintSize to calculate overhead
https://github.com/tendermint/go-amino/blob/0c74291f3bb61e24f8ea1d13148cece479f79d35/encoder.go#L85-L90
* avoid cyclic imports
* you can do better Go, come on
* remove testdouble package

* ungitignore
* add docs/.vuepress to enable local builds
* config.js needs to be here, one less step
* docs: make spec in sidebar nicer
* docs: local build instructions

Closes: #2460

* Pass http.ServeTLS() errors back to the caller
* Update CHANGELOG
* Amend StartHTTPServer() too for consistency's sake
* Revert "Amend StartHTTPServer() too for consistency's sake"
This reverts commit 23bfb4c.