Rename all ProfilePanels into ProfileMenuItems

Summary: Ref T11957.

Test Plan:
  - Viewed an existing project profile.
  - Viewed a user profile.
  - Created a new project.
  - Edited a profile menu.
  - Added new profile items.
  - Grepped for renamed symbols.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T11957

Differential Revision: https://secure.phabricator.com/D17028

src/applications/project/controller/PhabricatorProjectSubprojectsController.php

@@ -92,7 +92,7 @@ final class PhabricatorProjectSubprojectsController
       ->addPropertyList($property_list);
 
     $nav = $this->getProfileMenu();
-    $nav->selectFilter(PhabricatorProject::PANEL_SUBPROJECTS);
+    $nav->selectFilter(PhabricatorProject::ITEM_SUBPROJECTS);
 
     $crumbs = $this->buildApplicationCrumbs();
     $crumbs->addTextCrumb(pht('Subprojects'));