Support for BigPemu for Atari Jaguar

[Tak-MK]

Title plus serializing the save so we can check the progress if it's not too difficult 😄

[RayCarrot]

Hi! I'll try and add this in the next update 🙂 I already had a look at the save format now and have been able to serialize it all, so that will be included too.

[RayCarrot]

I'll close this now since it has been added to the main branch and will be included in the next update (which should be out soon).