* Add an option to select the library view mode.
This will allow us to instantiate only one library view at startup,
reducing time and complexity of the process.
* Instead of using legendary's locale as fallback, use system't locale
as default.
* Do not hardcode language names and countries but use QLocale on
the translation filenames.
* 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.
