* Introduce bgms
* Fill in bgm enums
* Rename bgm to clearer names
* Fix spacing
* Fix "No_Music" define
* remove comment
* Improve bgm names, found another seqId function
* Another seqId function
* Another name change
* Woods of Mystery -> Sarias Song
* add saria's song bgm to pierre
* Another bgm function found!
* Add bgm's to `gSaveContext.seqIndex`