Merge branch 'ps/history'

"git history" history rewriting UI.

* ps/history:
  builtin/history: implement "reword" subcommand
  builtin: add new "history" command
  wt-status: provide function to expose status for trees
  replay: support updating detached HEAD
  replay: support empty commit ranges
  replay: small set of cleanups
  builtin/replay: move core logic into "libgit.a"
  builtin/replay: extract core logic to replay revisions

diff --cc Makefile
Simple merge

diff --cc builtin.h
Simple merge

diff --cc t/meson.build
Simple merge