Feature Request - Lots of Accuracy improvements

[Michael-Prince-Sharpe]

There's a repository here that has a bunch of accuracy improvements like more mappers some of which aren't present in the main branch here an example being the nuked core for the VRC7 mapper. Interestingly in the linked repository, there's a libretro core that can be downloaded from the releases tab.

https://github.com/mkwong98/Mesen