The default widgets only implement the settings for the `default` "app_name"
The game specific widgets sub-class the default widgets and implement
whatever they additionally need locally.
Remove multiple calls to save config and save when the game settings gets hidden.
* Use `vars()` instead of directly accessing `__dict__`
* Remove `auto_update` from RareGame's metadata
* Correct check for updating the Steam App ID (We want to keep any changes from the user)
* Collect both Wine and Proton prefixes when removing overlay registry keys.
* Add few convenience functions in config_helper and paths.