Audit - fix erroneous mentions of tasks, etc via commit message

Summary: we don't want to mention these phids... when expanding transactions, build the unmnentionable map and make it so. slightly hairy due to how the editor framework works, but overall i think this is the right place to put these hooks.  Fixes T6331.

Test Plan: made a commit with a commit message that had fixes, refs, depends on, and auditors and saw no erroneous mentions

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, chad, epriestley

Maniphest Tasks: T6331

Differential Revision: https://secure.phabricator.com/D10721