New version of the ZX Spectrum emulator for Mac.

Changelog:

* Working on generic emulation of the b&w machines:
* Jupiter Ace: memory (3K), keyboard and video decoding. tape i/o mostly usable.
* ZX80: memory (1K), keyboard and highres video decoding. tape i/o partly usable.
* ZX81: memory (2K), keyboard and highres SLOW/FAST video decoding. tape i/o mostly unusable.


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