* Allow to configure yt-dlp `--format-sort` argument
This exposes the [`--format-sort`][1] yt-dlp option to the user.
Implements parts of #316
[1]: https://github.com/yt-dlp/yt-dlp#sorting-formats
* Trim split values of format_sort, obey black
* Add `format_sort` to default configuration
* Add note about codec compatibility to settings page