Summary:
Depends on D20464. Ref T13277. Broadly:

  - Move all the "should publish X" and "why aren't we publishing X" stuff to a separate class (`PhabricatorRepositoryPublisher`).
  - Rename things to be more consistent with modern terminology ("Publish", "Permanent Refs").

Test Plan:
This could use some trial-by-fire on `secure`, but:

  - Grepped for all symbols.
  - Viewed various commits.
  - Reparsed commits.
  - Here's a commit with an explanation:

{F6394569}

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13277

Differential Revision: https://secure.phabricator.com/D20465