Summary:
Ref T1809. Provide ApplicationSearch to Flags and allow the user to select flags by color.
@chad might have some design feedback on my control.
Test Plan: {F54131}
Reviewers: btrahan, chad
Reviewed By: chad
CC: aran
Maniphest Tasks: T1809
Differential Revision: https://secure.phabricator.com/D6747
