added check for What's That Song?

fixed boss intro jingle still playing if player skipped boss intro

fixed shuffle/randomize sometimes not working while in a special room type while continuous floor music was enabled

fixed boss fight music cutting off boss intro jingle if it was longer than the cutscene

-fixed room music continuing through the game over music if you died while in a special room while continuous floor music was enabled
-fixed game over jingle and music jukebox text not showing if died while in a special room while continuous floor music was enabled

fixed mod sometimes getting an error when quitting a run while in a special room while continuous floor music is enabled

fixed jukebox text sometimes not being displayed for repentogon music jingles

-Adjustments to variant track system
-added menu, nightmare and game over tracks to all included soundtracks