Apply normal Audit actions directly with Transaction editor
Summary: Ref T4896. This converts the last "CommentEditor" to a transaction editor and removes a large part of the old code.
Test Plan:
- Added comments.
- Accepted / added auditors.
- Added inline comments.
Reviewers: joshuaspence, btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T4896
Differential Revision: https://secure.phabricator.com/D10128