Merge branch 'lc/rebase-trailer' into seen

Refactor code paths to run "interpret-trailers" from "git
commit/tag" and use it in "git rebase".

* lc/rebase-trailer:
  rebase: support --trailer
  trailer: append trailers in-process and drop the fork to `interpret-trailers`
  trailer: move process_trailers to trailer.h
  interpret-trailers: factor out buffer-based processing to process_trailers()

diff --cc Documentation/git-rebase.adoc
Simple merge

diff --cc builtin/tag.c
Simple merge

diff --cc sequencer.c
Simple merge

diff --cc t/meson.build
Simple merge

diff --cc wrapper.c
Simple merge

diff --cc wrapper.h
Simple merge