adedd check for custom track types

fixed jukebox not allowing mods to add their track list if it was one of the soundtracks the jukebox mod has a preset tracklist for
(would cause an issue if the soundtrack mod is updated and the tracklist in the jukebox mod is out of date)

added even more error checking to the addtitles function

added more thorough error checking to the AddTitles function used by other mods

added check for nil/invalid track list to prevent the game from shitting itself if a mod calls the add track list function without an actual track list

updated for compatibility with the game over and hush phase 1 tracks of soundtrack menu

updated flash and antibirth tracklists and neatened up description

fixed the "line 45" exception

removed unnecessary save call and added extra load, hopefully will fix things for people having save issues