Merge branch 'zh/ref-filter-raw-data'

Prepare the "ref-filter" machinery that drives the "--format"
option of "git for-each-ref" and its friends to be used in "git
cat-file --batch".

* zh/ref-filter-raw-data:
  ref-filter: add %(rest) atom
  ref-filter: use non-const ref_format in *_atom_parser()
  ref-filter: --format=%(raw) support --perl
  ref-filter: add %(raw) atom
  ref-filter: add obj-type check in grab contents

diff --cc quote.h
Simple merge

diff --cc ref-filter.c
Simple merge