* m116: Fix support for Huang-2 chip
* Provide 8K CHR ram if no CHR rom/ram is provided due to bad headers
* m15: Implement CHR write-protect
* Update Namco 106
- Cleanup save state struct
- Implement nametable mirroring
- fix sound issue (fceux)
Co-authored-by: negativeExponent <negativeExponent@users.noreply.github.com>