Enables global and per-playlist permission configuration.

Each playlist may have permissions configured the same as actors/journals:

• none: Player cannot see this Playlist
• limited: Player can see this Playlist but (by default) not its contents.
• observer: Player can see this Playlist and its contents.
• owner: Player can edit the Playlist and its contents (with an appropriate minimum role, based on settings)

Via module settings, you can configure a minium role to be able to:

• Playback: Players of at least this role can control playback of playlists/songs that they can see.
• Edit: Players of at least this role can edit playlists they own and create new playlists/folders.

Note: Players can delete playlists/folders that they created. They can also edit the ownership of playlists they created.

Additionally, you can configure:

• Minimum control permission: Users with an appropriate role can control playback of playlists they have at least this ownership level of.
• Limited viewers can see songs?: Whether users with "limited" ownership of a playlist see only the title, or also the songs

Removed, may investigate a simplified approach at a later time.