Implemented playlist shuffling and repeat toggle button functionality.
Swapped out a considerable amount of NULL checks for proper KOTO_IS_BUTTON and GTK_IS_VOLUME_BUTTON macro checks.
Implemented GQueue played_tracks add / removal functions for KotoPlaylist, ensure randomizing works properly.
Start work on MPRIS.
Remove unused glade UI file. Added CSS classes to various components. Fix some alignment issues. Renamed our albums_strip to favorites_list.
Implement recursive file parsing in KotoIndexedAlbum with the intent of using it for "discs" / CD, useful for albums like Foo Fighters: In Your Honor that have 2 or more CDs. Still need to work on refining this further.
Add stub function in our album view for a planned separation of the track listing so we can do it based on discs and other depth-of-3 sub-folders.
