Start implementation of database functionality, starting with table generation.

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.

src/indexer/file.c

@@ -268,7 +268,7 @@ void koto_indexed_file_set_file_name(KotoIndexedFile *self, gchar *new_file_name
 }
 
 void koto_indexed_file_set_cd(KotoIndexedFile *self, guint cd) {
-	if (cd <= 1) { // No change really
+	if (cd == 0) { // No change really
 		return;
 	}