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

-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

-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

fixed jukebox text sometimes not appearing when using continuous floor music

fixed continuous floor music getting messed up if shuffle/randomize frequency was set to new room

-added a continuous floor music mode (accessible in the 'other options' page of the config menu)

-fixed devil/angel door appear jingles sometimes restarting boss room music even if the soundtrack was set to not interrupt