Added Activity that shows songs sorted by Year
Added way to create dynamically a "Now Playing" context item
Added support for Playlists - now it lists songs inside them and plays it too!
Safety checks added for Service
Added new button for "Create New Playlist" on the Now Playing window (and added some stuff for the music service)
Changed Service on the project folder structure
FINALLY added way to user create custom playlists at RUNTIME, yay!
Replaced some hardcoded strings by Android resources
Defined package version (following Semantic Versioning), roughly estimated from previous work. Also, added ways to get package metadata on kMP
Removed obsolete code and moved some classes around