Make ostracon/main based on Tendermint v0.34.8

[torao]

Closes: #XXX

Description

This PR migrates all previous changes and fixes of Ostracon (formerly LINE Blockchain) applied in Tendermint v0.33.x to ostracon/main, which is based on Tendermint v0.34.8. In addition to Tendermint v0.34.8, Ostracon introduces or fixes the following features:

• Proposer election scheme has been changed from predictable round-robin to more secure weighted random sampling based on StakingPower. This uses VRF as a non-falsifiable cryptographic pseudo-random number generator.
• In order to modify the incentive scheme, we have changed the consensus to elect a part of the Validators as Voters. We have also changed a part of ABCI to distribute the votes of the selected Voters in the Cosmos SDK reward distribution.
• In addition to ed25519, BLS has been added experimentally to the signature scheme for consensus. The BLS signatures contained in a commit are aggregated into a single signature, which is expected to reduce communication costs and storage size.
• Reactor has been modified to run asynchronously to improve performance.

Note for reviewers:

• Setting up the CI environment, testing, LINTing, etc. are going to do in later tasks. Please ignore these checks in this PR.
• The specification of each feature should be pointed out in a separate issue.

---

For contributor use:

• Wrote tests
• Updated CHANGELOG_PENDING.md
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Updated relevant documentation (docs/) and code comments
• Re-reviewed Files changed in the Github PR explorer

[Kynea0b]

This folder libs/autofile/_test_HtEYbTB5QlzT is probably an unnecessary folder, so please delete it.

[tnasu]

I finished the first review. Please check my comments include nit feedbacks.

[tnasu]

For building, could you patch the below? (Using 1.15-alpine)

$ git diff
diff --git a/Makefile b/Makefile
index 1c6b0c0e8f..d84c821bf8 100644
--- a/Makefile
+++ b/Makefile
@@ -251,7 +251,7 @@ DOCKER_HOME = /go/src/github.com/tendermint/tendermint
 DOCKER_CMD = docker run --rm \
                         -v `pwd`:$(DOCKER_HOME) \
                         -w $(DOCKER_HOME)
-DOCKER_IMG = golang:1.14.6-alpine3.12
+DOCKER_IMG = golang:1.15-alpine
 BUILD_CMD = apk add --update --no-cache git make gcc libc-dev build-base curl jq file gmp-dev clang \
        && cd $(DOCKER_HOME) \
        && make build
diff --git a/networks/local/localnode/Dockerfile b/networks/local/localnode/Dockerfile
index f47557fca3..ee3a366620 100644
--- a/networks/local/localnode/Dockerfile
+++ b/networks/local/localnode/Dockerfile
@@ -1,4 +1,4 @@
-FROM golang:1.14-alpine
+FROM golang:1.15-alpine
 MAINTAINER Greg Szabo <greg@tendermint.com>
 
 RUN apk update && \
diff --git a/tools/proto/Dockerfile b/tools/proto/Dockerfile
index 5008226904..a056f307e0 100644
--- a/tools/proto/Dockerfile
+++ b/tools/proto/Dockerfile
@@ -1,6 +1,6 @@
 FROM bufbuild/buf:latest as buf
 
-FROM golang:1.14-alpine3.11 as builder
+FROM golang:1.15-alpine as builder
 
 RUN apk add --update --no-cache build-base curl git upx && \
   rm -rf /var/cache/apk/*

Ref:

$ find ./ -type d -name .git -prune -o -type f | xargs grep alpine
.//tools/proto/Dockerfile:FROM golang:1.14-alpine3.11 as builder
.//tools/proto/Dockerfile:FROM alpine:edge
.//tools/proto/Dockerfile:RUN echo 'http://dl-cdn.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories && \
.//DOCKER/Dockerfile:FROM golang:1.15-alpine as builder
.//DOCKER/Dockerfile:FROM golang:1.15-alpine
.//Makefile:DOCKER_IMG = golang:1.14.6-alpine3.12
.//networks/local/localnode/Dockerfile:FROM golang:1.14-alpine
grep: .//.git: Is a directory

[Kynea0b]

LGTM