Move PhabricatorObjectItem to PHUIObjectItem, add 'plain' setting for lists.

Summary: Adds plain support for object lists that just look like lists

Test Plan: review UIexamples and a number of other applications

Reviewers: epriestley, btrahan

Reviewed By: epriestley

CC: Korvin, aran

Differential Revision: https://secure.phabricator.com/D6922

src/applications/differential/controller/DifferentialRevisionListController.php

@@ -84,7 +84,7 @@ final class DifferentialRevisionListController extends DifferentialController
     }
 
     if (count($views) == 1) {
-      // Reduce this to a PhabricatorObjectItemListView so we can get the free
+      // Reduce this to a PHUIObjectItemListView so we can get the free
       // support from ApplicationSearch.
       return head($views)->render();
     } else {