Summary:
Ref T5532. This adds:
- Documents can designate that they should be signed by "Corporations" or "Individuals".
- Corporate documents get different fields and a different exemption process.
- Basically everything works the same but this is like a zillion lines of form code.
Test Plan: See screenshots.
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T5532
Differential Revision: https://secure.phabricator.com/D9812
