Integrate auxiliary fields into Maniphest transactions
Summary:
- When changing auxiliary field values, use transactions.
- Clean up some of the load/save logic for auxiliary fields so it's a little
more performant.
NOTE: The transaction display of auxiliary fields is incredibly hacky, I'll
follow up with a more nuanced approach but wanted to limit scope here.
Test Plan: Created and edited tasks with custom fields configured; created and
edited tasks without custom fields configured.
Reviewers: btrahan, jungejason, zeeg
Reviewed By: jungejason
CC: aran, jungejason
Maniphest Tasks: T418
Differential Revision: https://secure.phabricator.com/D1283