Separate email formatting options into a new panel
Summary:
Ref T5861. These two options are complex, rarely useful, and not directly related to controlling what mail you receive.
Move them to a separate panel to make way for more stuff on the preferences panel. We'll probably add an "HTML" option to this new panel eventually, too.
Test Plan:
- Used both panels.
- Tested with multiplexing off.
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T5861
Differential Revision: https://secure.phabricator.com/D10236