JSON/CSV support for playlist IDS

[vecat]

I'd like to specify which playlists from my profile to sync rather than all public. With many public playlists having them all sync through can be problematic.

I imagine that this should be fairly easy to implement, perhaps even within the environment variables and that these playlist IDs are already coming into account as they are for the Deezer side.

All playlists follow the same url structure: https://open.spotify.com/playlist/1A2B3C...