Mazogs port

Don't be fooled by the primitive graphics, this 1982 ZX81 classic is loads of fun to play and has many ways to play. The graphics card for RC2014 is capable of much more than the black and white character graphics here, but I've stuck to the original game as closely as possible. I've used Paul Farrow's disassembly and stuck as closely as possible to the original code. I've added a little bit of co…