[Feature request]: MD Emu: Add Support for Full Sega Mapper.

[GabrielPlays421]

Describe the feature

Hi I want the Full Sega Mapper Support because I can't play some games on it, more likely Rom Hacks. https://plutiedev.com/beyond-4mb <- this explains what Im trying to say, some Roms that is above 4MegaBytes need this to work, but however MD Emu doesn't have this. So I have to play in another emulator because my favorite Emu doesn't supports. I hope this gets added.😣

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