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Fix Cortex-M4 build for conway, rotozoom, tunnel.
My portability refactoring broke the microcontroller demos. :-) Problems: 1. In both conway and rotozoom, I "refactored" the call to vga.video_on() into...nothing. 2. In conway and tunnel, I changed code from using references to fixed-size arrays, into code using slices. This produced a bunch of bounds checks, which dropped us to 30fps in both cases. I have hoisted the bounds checks to the top of each render routine.
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