FMod - Song name migration

An Abiathar user asked for the ability to import a different format of song into the audio archive. I think the best way to implement this would be to allow importing any file directly into the audio archive without having Abiathar try to parse it. Unfortunately FleexCore2 currently isn't designed to load files without parsing them fully. Abiathar also assumes that IMF songs in the audio archive can have a "tag block" after the song data and takes advantage of that area to store the user-provided song name. Not every format will have space for a tag, so today I changed the Music Mappings dialog to store the name in the ADEPS (Abiathar project) file instead. 

That would be a simple change if not for the backwards compatibility concern. Users may already have set song names that existing Abiathar versions then wrote into the audio archive. It would be bad to lose those when updating. I wrote some migration code to detect when the project's audio files haven't been saved since an old Abiathar version and, if so, load them using the old architecture just to copy the names from the tags to the project file. With this working, I can start on a new architecture to allow greater format flexbility.