Implement functionality for gracefully showing the play button on top of KotoAlbumArt images. Implemented a new koto_indexed_album_set_as_current_playlist function for setting an album as the current playlist, useful when clicking to play an album via its artwork.
This database will be stored in the user's XDG_DATA_HOME directory under a folder called `com.github.joshstrobl.koto`.
Refactored Koto Track Listing into a dedicated Disc View component, break apart out CDs / Discs into relevant Disc View components, sorting them by the disc and showing a label if there are more than one discs / CDs.
Started using the row-activated event for our Artist GtkListBox instead of having press events on the artist buttons. Makes switching between artists far more reliable. Added a slide left / right stack animation and set its animation to 400ms so it's in the goldilocks zone (IMO) of not being too fast or too slow.
Fix a warning related to scale factor fetching in the PlayerBar.
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.
