SoundCloud integration added to User Screen

Users can now log in to their SC accounts.  If they like or unlike a
song in the Bounce app, it gets put in or removed from their SC account
likes.  Note that this does not yet take existing SC likes and put them
in as Bounce likes.  The  app crashes after a build one or two times
but it’s because of deprecated SC code which sucks.  But it’s fine
after the first one or two runs.