Implement view and edit policies in Differential CustomFields
Summary:
Ref T3886. Ref T418.
- Adds "View Policy" and "Edit Policy" fields.
- Allows CustomFields to produce arbitrary types of transactions, so these fields can produce standard view/edit policy transactions and get all the strings and validation associated with them.
Test Plan: {F116001}
Reviewers: btrahan
Reviewed By: btrahan
CC: aran
Maniphest Tasks: T418, T3886
Differential Revision: https://secure.phabricator.com/D8287