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

soundtrack menu:
-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 soundtrack menu sometimes getting an error when quitting a run while in a special room while continuous floor music is enabled

soundtrack menu:
fixed jukebox text sometimes not being displayed for repentogon music jingles

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

soundtrack menu:
fixed boss defeated music sometimes playing into the nightmare scene when continuous floor mode was enabled

soundtrack menu:
-another attempt at fixing the 'high volume' bug that I haven't been getting on my end
-fixed boss kill jingle, devil door spawn jingle and angel door spawn jingle all playing over each other (without forcing the boss defeated music to have to wait for them to finish)
-added feature for having randomized variations of a track

soundtrack menu:
-fixed music being weird if you changed soundtrack or continued a run while in a special room with continuous floor music mode on
-fixed jukebox text showing the floor music title instead of the room music title when continuous floor music mode is on