R1:f8e7d8f65cc8

Move ActionHeaders to PHUI, add ObjectBox Support, new Colors

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