fixed AB+ code trying to reference something that only exists in repentance

fixed bug with custom lua soundtracks setting a track to use the run start jingles or main menu music

added the ability to have additional custom soundtrack setups

tweaks to check for stageAPI messing with music in non-custom floors

added extra error check in continuous floor music function

-fixed continuous floor music sometimes not working if you had stageAPI running
-fixed music restarting if you moved in or out of a treasure room while in a stageAPI floor or 'override floor' with certain settings
-fixed some stageAPI checks not working if you were running the menu in custom mode and the current track was set to shuffle or random

fixed hush death jingle not playing when used with MMC on Rep+

added option to disable using variant tracks

added alt flash secret room reveal jingle

fixed shuffle setting the current music to devil room if triggered during the mega satan fight