Summary: Still needs some cleanup, but ready for review in broad outline form.
Test Plan:
Made lots of policy changes to the Badges application and confirmed expected rows in `application_xactions`, confirmed expected changes to `phabricator.application-settings`.
See example output (not quite working for custom policy objects) here:
{F4922240}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin, chad, epriestley
Maniphest Tasks: T11476
Differential Revision: https://secure.phabricator.com/D17757
