R1:6b9f4a918b85

Modularize PhabricatorEditEngineConfigurationTransaction

Summary: Ref T13319. Ref PHI1302. Migrate `PhabricatorEditEngineConfigurationTransaction` to modular transactions and add some additional transaction rendering to make these edits less opaque.

Test Plan: Hit all the form edit controllers, viewed resulting transaction timeline.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T13319

Differential Revision: https://secure.phabricator.com/D20595