Add a sort order to the favorites menu

Summary: These were once ordered, but I think we switched to being defined in the Engine and never implemented the sorts there. This adds sort ordering to Tasks, Projects, and Repositories.

Test Plan: Review Favorites Menu in local install, see order is now set per the engine. Click Edit Favorites, and re-order. See order sticks.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D17490

src/applications/diffusion/editor/DiffusionRepositoryEditEngine.php

@@ -24,6 +24,10 @@ final class DiffusionRepositoryEditEngine
     return true;
   }
 
+  public function getQuickCreateOrderVector() {
+    return id(new PhutilSortVector())->addInt(300);
+  }
+
   public function getEngineName() {
     return pht('Repositories');
   }