Update menu_base implementation, assets and documentation

manifest.json

@@ -15,6 +15,7 @@
     {"id": "new_game", "activate": ["--itest=new_game"]},
     {"id": "hot_reload", "activate": ["--itest=hot_reload"]},
     {"id": "collection_edit", "activate": ["--itest=collection_edit"]},
-    {"id": "display_settings", "activate": ["--itest=display_settings"]}
+    {"id": "display_settings", "activate": ["--itest=display_settings"]},
+    {"id": "resettables", "activate": ["--itest=resettables"]}
   ]
 }