Replace projects side menus with top menus

The top menus are submenus to the Project Menu and
they appear only when a project has been selected.

Change-Id: Ia520c43ba282d41cbd1bd6f1c880462d05f6df4a

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AdminConstants.java

@@ -102,11 +102,7 @@ public interface AdminConstants extends Constants {
   String groupTabMembers();
   String projectListTitle();
   String createProjectTitle();
-  String projectAdminTabGeneral();
-  String projectAdminTabBranches();
-  String projectAdminTabAccess();
   String projectListQueryLink();
-  String projectAdminTabDashboards();
 
   String plugins();
   String pluginEnabled();