DirXMLDevWeb 0.78.0

Needs DirXMLDev 0.54.0.

Added

• Compare projects (docs/compare-projects.md), for teams that
  keep a project per environment:
  • The comparison: this project and another, both read from their base branch as the
    repository has it, in this project's terms (the pair's map, promotions/<source>.properties).
  • The list: by driver, each difference sorted by the pair's promotion record into pending,
    both changed, this project's own, not paired yet, known and unchanged. Values that differ are
    listed apart and never make their file look changed.
  • The review: each file side by side, this project's against what promoting writes (the
    other project's logic with this project's values), merged line by line if you want.
  • Promote: the ticked files and values go into a new branch, promote/<source>-<time>,
    made from the base. The result is validated, committed as you with the promotion record and a
    Promoted-from: trailer, and pushed. The page then opens the branch, where the bar offers
    the pull request. A promotion that wouldn't validate, or that adds a file without its
    manifest, is refused before any branch is made.
  • The audit log records each one as promote.
  • API: GET /api/promote/projects, GET /api/promote/compare, POST /api/promote/apply.