Replace Sprite-Icons with FontAwesome

Summary: The removes the sprite sheet 'icons' and replaces it with FontAwesome fonts.

Test Plan:
- Grep for SPRITE_ICONS and replace
- Grep for sprite-icons and replace
- Grep for PhabricatorActionList and choose all new icons
- Grep for Crumbs and fix icons
- Test/Replace PHUIList Icon support
- Test/Replace ObjectList Icon support (foot, epoch, etc)
- Browse as many pages as I could get to
- Remove sprite-icons and move remarkup to own sheet
- Review this diff in Differential

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: epriestley, Korvin, hach-que

Differential Revision: https://secure.phabricator.com/D9052

src/applications/project/controller/PhabricatorProjectMembersEditController.php

@@ -134,7 +134,7 @@ final class PhabricatorProjectMembersEditController
 
       $item->addAction(
         id(new PHUIListItemView())
-          ->setIcon('delete')
+          ->setIcon('fa-times')
           ->setName(pht('Remove'))
           ->setHref($remove_uri)
           ->setWorkflow(true));