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/dashboard/controller/PhabricatorDashboardViewController.php

@@ -79,7 +79,7 @@ final class PhabricatorDashboardViewController
     $actions->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Edit Dashboard'))
-        ->setIcon('edit')
+        ->setIcon('fa-pencil')
         ->setHref($this->getApplicationURI("edit/{$id}/"))
         ->setDisabled(!$can_edit)
         ->setWorkflow(!$can_edit));
@@ -87,7 +87,7 @@ final class PhabricatorDashboardViewController
     $actions->addAction(
       id(new PhabricatorActionView())
         ->setName(pht('Add Panel'))
-        ->setIcon('new')
+        ->setIcon('fa-plus')
         ->setHref($this->getApplicationURI("addpanel/{$id}/"))
         ->setDisabled(!$can_edit)
         ->setWorkflow(true));