soundtrack menu:
added extra checks to a StageAPI workaround function

moved extra custom soundtrack stuff to a separate mod so there won't be conflicts/overwriting from mod updates (and makes it a bit simpler)

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

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

soundtrack menu:
-added the ability to have additional custom soundtrack setups
-fixed a function that was referring to the standalone version

chain drag refactoring

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

soundtrack menu:
added extra error check in continuous floor music function

custom starting items:
-fixed bug where if a character was enabled but had items set as defaults the mod would sometimes give an extra copy of the default items

Soundtrack Menu:
-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