Summary:
Ref T2222. This isn't complete and doesn't change runtime behavior yet (the new fields are not glued to the interface), but implements many fields.
(The remaining fields have something weird going on with them, for the most part.)
Test Plan:
With additional changes, rendered most fields sensibly:
{F118834}
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T2222
Differential Revision: https://secure.phabricator.com/D8354
Summary: Ref T3886. Now that a custom field can emit a core transaction, just emit a subscribers transaction.
Test Plan: {F116014}
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T3886
Differential Revision: https://secure.phabricator.com/D8289