Add touch feedback to GameGridActivity and AddDirectoryActivity.

Source/Android/app/src/main/res/menu/menu_add_directory.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- TODO Please give me an icon! -->
     <item
         android:id="@+id/menu_up_one_level"
         android:title="@string/add_directory_up_one_level"