Quickie: Sam Coupé 3d stress test

This shows how my 3d code currently looks. Multiple objects and multiple colours abound. And the frame rate is starting to drop. There's some bug in reverse face removal which I'm going to have to take time out to fix before I can do a more thorough stress test. However, I felt that this was enough to distinguish my code from cheap demo effects.

The code is now formulated as an open library for 3d graphics, designed around an easy interface for third parties.

For the purposes of exposition: the Sam Coupé is a z80-based computer from the late 1980s. It boasts a 256×192, 16 colour display and a processor that, in real terms, runs at about 4 Mhz.

My code could probably be adapted to any z80 platform.

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