Add yt-dlp fallback for stream extraction

[gechoto]

This should fix the current playback issues: #1748

This is not a perfect solution:

• it increases the apk size by a lot (includes python)
• it is slow
• is increases data usage (downloads the player js again and again for every stream)

But in my testing so far it works.
If you have a better idea feel free to share.

I tried to counter the slowness by only using this as a fallback for now.
In the long term it might be more reliable to offload more to yt-dlp.

I know the code is not the best. We can improve on that later.
However it should be fine for now as a quick fix.

Needs more testing.

TODO - before release:
- disable sending login info when using IOS client (it does not support login anymore but results in an error) DONE

TODO - for later:

• maybe build split apks to decrease apk size
• see if there is a way to cache the player js to decrease data usage
• maybe update yt-dlp less often (daily + manual?) (currently every app start)
• check if the secure flag in the cookies file can be enabled
• maybe rename and optimize some stuff
• check if api_key can be removed from clients (it doesn't seem to be used anyone in recent clients?)
• check if TVHTML5 client can be removed

Note: This also contains a temporary change to set the cookie value to null if the user is logged out (because only null is considered logged-out). It can be removed after #1694 is done.

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