Add playlists as collections

[anatosun]

Since playlists are by default not shared in Plex, I usually use Collections to have my users commonly benefit from a list of tracks.

It would therefore be nice to have the option to add playlists as collections.

[AverageDave93]

@anatosun you can use playlist_to_collections.py to do this. https://github.com/Casvt/Plex-scripts/issues/212