Version is now generally pulled from the RELEASE_VERSION variable in
`src/VERSION`.
`VERSION=...` can be passed to make to override RELEASE_VERSION. The
special value `VERSION=*` will use the current timestamp as the version
(`YYmmddHHMMSS`). If neither VERSION nor RELEASE_VERSION are specified,
`SNAPSHOT` is used as the version.
- Fixed several dynamic range and popping/clicking APU bugs.
- Changed in-game hooks to be fpga-only. Hook is no longer run on SNES NMI or IRQ.
- Added save states (Save=X+R, Load=X+L) for development. To enable, modify sd2snes/config.yml sgb_* settings after booting new firmware. In-game hooks and buttons must be enabled for them to work. One state is recorded in the SRM file. Does not work with MSU audio on SD2SNES classic.
- Changed SD2SNES classic to only load MSU bit file for enabled ROMs to make development easier. The MSU bit file may lag in development.