v31.2

• Support BGAs in bmson files. In this version, there is a caveat when using BGAs in bmson file.
  • Due to current Bemuse architecture, every chart in the same song shares the same BGA. It case of multiple charts with different BGA, the BGA of the song will be selected arbitrarily.
  • Only 1 bga_event allowed, and it is expected to point to a WebM or MP4 file. Otherwise, the BGA is considered invalid and will not be loaded.