Better Queue Support and feature disable options

[CreativeIceWolf]

1. Options in settings to disable features of musicpod which the users don't use. I personally only want to use it for offline only music library with lyrics file present. It would be good if I can disable radio, podcast and a dedicated option to disable full internet connectivity (basically offline mode).

2. Lyrics pane and Queue pane be separate dedicated views with ability to open them from left sidebar and icons on the now playing right sidebar (optional). Better queue management system with support for having multiple queues (something like in Musicolet Android app).

3. Option to collapse left sidebar and middle pane so that only the now playing pane is left (with automatic collapse if screen width is limited). It will help in scenarios where user wants window tiling with multiple windows.

4. Playlist sync feature: Whenever a user modifies a playlist in MusicPod, it will sync those changes to a user chosen m3u file (with debouncing). It will help in managing/syncing playlists between devices (with help of syncthing etc).