Add a way to pass additional options to yt-dlp

[prokoma]

Since it is now necessary to have a working JS runtime and sometimes even pass cookies to yt-dlp, we need a way to pass some additional options to yt-dlp. When using the yt-dlp cli, it automatically loads defaults from config files. This is done in the parse_options and parseOpts functions, which are skipped in SendToKodi.

Please add a way to either input additional options in the settings screen or a checkbox to load the yt-dlp config files.