Moved theme into its own file, added message dialog state to show error messages, game install button is disabled when clicked and if there is an installer task pending or running

lib/page.rb

@@ -19,6 +19,9 @@ class W3DHub
       @host.main_thread_queue
     end
 
+    def update_application_manager_status
+    end
+
     def options=(options)
       @options = options
     end