Make file scanning single-threaded, add a bunch of notes as to why we did
Add CurrentSession() method to get most recently used session
Add IntExtensions
Initial commit of NowPlayingService and necessary functionality
Integrate NowPlayingService into stream and transcode APIs
Add endTime and automatic now playing removal at end of song
Add 'user' and 'client' filter parameters to NowPlayingApi
Add nowplaying to settings