soundtrack menu rep+ bugfix

fixed previous fix not working if tainted and regular run start jingles were switched

soundtrack menu: fixed run start jingle getting cut off by music if set to default

bug fix for mod pack not letting soundtrack menu load its settings for main menu music until starting gameplay

added some extra error checking for individual mod loading

devs broke the API update

soundtrack menu:
added a slight delay to the first song to play after a run start/continue

soundtrack menu:
added run start jingles for the Flash, Antibirth and Super Meat Boy soundtracks

soundtrack menu:
-added more error checking for stageAPI
-fixed the run start jingle function playing the 'rebirth' jingle instead of the 'default' jingle if the jingle was set to same as menu or random and the menu music or randomly chosen soundtrack was default