Advanced options to allow use of generic external player

[Hiers]

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Right now, all external players have to be hard coded into Freetube to be supported. This is fine, but there are users that want to use lesser known players with Freetube that might not be worth the effort of hard coding.

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To add an advanced option in the external player options with that would let a user complete the fields in external-player-map.json. A user could write the command arguments for playlists, offsets, playback, etc for the player in each proper field according to the mapping that Freetube uses.

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What has been done so far, hard coding it. For some cases (like iina) it might be unavoidable.

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[efb4f5ff-1298-471a-8973-3d47447115dc]

We support many external players since this was initially opened. To my knowledge it has been years since a request came in to support a player so i think this isnt really needed anymore