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In my tests SDL asks for only part of full buffer and we discard the other
part. It has 2 consequences:

1) Choppy sound
2) Emulation running too quickly

Circular buffer implements a queue and is completely flexible as to how
data is pushed and pulled from it.

I think the ROMS are copyright the Russian Govertment (due to the ROMS
technically being owned by the Soviet Govt, see the case of Tetris).
It's possible that the manufacturer got the rights back though...
I have honestly no idea.

And add another one for the Arcade Mini

This required a bit more trickery.
Also make sure to cleanly exit main.

BK emulator draws to a 32-bits screen surface, making it a bit tricky.
For now, we'll just use DisplayFormat and SDL_SoftStretch.

I'll add more resolutions later.

Again, this should at least make most games playable.
(and this includes going inside of Andos, CSIDOS and MKDOS and starting the executable)

Not a proper fix though but it works.

Should make it easier to play games at least.

(It also no longer requires mmap support)