Summary: Moves PhabricatorActionHeaderView to PHUIActionHeaderView, adds Red, Green, and Violet colors and extend ObjectBox to take colors and action headers.
Test Plan:
Tested new Welcome layout as well as UIExamples, Workboards, and Hovercards
{F169669}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D9707
