Add album art loading by decoding the album art URI into bitmaps for each album. I may use glide in the future if just using a bitmap isnt enough, but currently this works.
Remove the cover loading [For now] and permanently remove the genre loading, as both take too long to do in the loading screen. Will re-add album loading once more UI is added.
Turns out a dedicated Now Playing screen wont look that good, so refactor that into the Library screen. Also replace the ActionBar with a Toolbar and update the theming a bit.
