more unsucking, plus a year of new stuff

more unsucking, plus a year of new stuff

I was bad and didn't commit anything for ages, so here's an
approximation of what has changed:

 * moved common code into module, converted admin and upload to use it
 * Encapsulated parts of the interface into classes. The code is still
   pretty fugly.
 * New "normals" interface that allows general party goers to
   browse/search your library and throw songs in randomly.
 * Use yattag in more places
 * Layout is now using CSS flex boxes for better alignment and scaling
   for different screen sizes.
 * New commands to rate songs, bump songs to the top or bottom of the
   queue, search improvements, and probably some other things