Around 70% PBTS work was done on branch wb/proposer-based-timestamps (as sort of feature branch). However, that branch:

• wasn't merged back on master with a merge commit
• was rather "squash-merged" into a big PR: Proposer-Based Timestamps Merge tendermint/tendermint#7605.

This issue forward-ports tendermint/tendermint#7605 on our new feature branch feature/pbts.

• Forward port of tendermint/tendermint#7605, tendermint/spec#393, and tendermint/tendermint#8142 #2018
  • Original PR: Proposer-Based Timestamps Merge tendermint/tendermint#7605, this is a big "merge-squash" PR.
    • The original merge-squash PR contains the following smaller PRs (which have thus been forward-ported in this PR)
      • state: add an 'IsTimely' method to implement the 'timely' check for proposer-based timestamps tendermint/tendermint#7170
      • factory: simplify validator and genesis factory functions tendermint/tendermint#7305
      • consensus: refactor the fake validator to take a clock source tendermint/tendermint#7300
      • consensus: add calculation for proposal step waits from pbts  tendermint/tendermint#7290
      • consensus: ensure proposal receipt waits for maxWaitingTime tendermint/tendermint#7307
      • types: remove accuracy from timestamp params tendermint/tendermint#7341
      • internal/consensus: refactor ensure functions to use a common function tendermint/tendermint#7373
      • types: add new consensus params from proto tendermint/tendermint#7354
      • internal/consensus: proposer waits for previous block time tendermint/tendermint#7376
      • Remove MedianTime, set block time to Now() tendermint/tendermint#7382
      • internal/consensus: remove proposal wait time tendermint/tendermint#7418
      • internal/consensus: prevote nil if proposal timestamp does not match tendermint/tendermint#7391
      • Fix pbts tests tendermint/tendermint#7413
      • consensus: check that proposal is non-nil before voting tendermint/tendermint#7480
      • Prevote nil if proposal is not timely tendermint/tendermint#7415
      • proto: rename timing params to synchrony params tendermint/tendermint#7554
      • Remove votetime tendermint/tendermint#7563
  • This fw-port PR also includes two other PRs not included in Proposer-Based Timestamps Merge tendermint/tendermint#7605 but needed by it
    • proto: merge the proposer-based timestamps parameters tendermint/spec#393 (protobufs, which were in a separate repo at the time)
    • types: update synchrony params to match checked in proto tendermint/tendermint#8142

DoD

• Forward-port Proposer-Based Timestamps Merge tendermint/tendermint#7605 and all other needed PRs
  • Exclude unnedded refactoring not related to PBTS
• Production code builds
• Unit and e2e tests pass