Implement initial audiobook UX (some of which is a bit of a WIP).

- Renamed various components and moved them to src/components.
- Renamed KOTO_PREFERRED_MODEL* to KOTO_PREFERRED_PLAYLIST*
- Renamed koto string utility functions to always be prefixed with koto_utils_string_ for consistency.
- Added configuration options for show / hiding various album information, as well as preferred sort type.
- Changed db schema to reflect various metadata changes (sorry).
- Implemented genre, narrator, year aggregation from KotoTrack to KotoAlbum for use in KotoAlbumInfo and audiobooks.
- Rearchitected our playlist functionality for KotoAlbums to always have an inner KotoPlaylist that is used.
- Added various getters / setters for new koto_album functionality.
- Implement aggregation of KotoAlbum pointer aggregation in the KotoArtist as a GQueue and GListStore instead of GList so we can get all the albums associated with an artist and use the GListStore for the audiobook view.
- Implement some initial album sorting in Artists (more work to do on this front).
- Many improvements to file indexing logic for CD and position detection, various new koto_track_helpers.
- Add new logic for knowing when to hide playlists given we generate them for each Album now.
- Fix missing updates of KotoPlaylist in KotoNav.
- Added playback position to KotoPlayerbar, renamed bar refs to self.
- New Playlist state saving.
- Updated track ticking logic for track in KotoPlaybackEngine.
- Fixed playback position detection in our KotoPlaybackEngine by swapping from GST_FORMAT_DEFAULT to GST_FORMAT_TIME.
- Changed our get_progress to divide by GST_SECOND.
- Fixed missing type checks in various KotoPlaybackEngine functions.

Fixes #13. Fixes #14. Fixes #15.

theme/components/_audiobook-view.scss

@@ -0,0 +1,34 @@
+// This is the styling for the Audiobook VIew
+
+@import '../vars';
+
+.audiobook-view {
+	.side-info { // Side Info
+		margin-right: $halvedpadding;
+
+		button,
+		image {
+			margin-bottom: $halvedpadding;
+		}
+
+		button { // Play / Continue Playback button
+			font-size: large;
+			font-weight: bold;
+		}
+
+		& > label {
+			font-size: large;
+			
+			&:last-child {
+				margin-bottom: $halvedpadding;
+			}
+		}
+	}
+
+	.chapters-label { // Chapters label after album info
+		color: $text-color-faded;
+		font-size: x-large;
+		font-weight: bold;
+		padding: $halvedpadding 0; // Top / bottom padding
+	}
+}