Add addtional hints you haven't submitted comments on a Diff
Summary: Ref T3669. Probably. Adds a yellow warning at the top of the Diff View and makes the comment draft icon yellow on lists of revisions.
Test a diff with many warnings, see warning. Test a diff with draft comments, see warning. Test new icon in list view.
Reviewers: btrahan, epriestley
Reviewed By: epriestley
Subscribers: Korvin, epriestley
Maniphest Tasks: T3669
Differential Revision: https://secure.phabricator.com/D10789