Allow to use yt-dlp to be able to play from more websites

With --yt-dlp we try to get an URL from yt-dlp.

We currently do as little yt-dlp config as possible so users can use device specific configuration. Make sure you select a video with combined audio and video, a hw accelerated format and a suitable resolution for your platform. (We might want to refine this in an update allowing to pick device specific defaults as well).

Closes: #6 (closed)