Split out GPU functions into a separate library

[bradgrantham]

Right now there's the potential for drift between the gpu code in hardware_rasterizer.c and the other files.

All code interacting with the GPU should probably be in one C file.

[lkesteloot]

You mean the cmd_draw() functions, etc? I can take this one.

[bradgrantham]

Yeah and some sloppy gpu_ functions I wrote to do think like start the gpu, wait on F2H_BUSY, etc. And it would be nice to wrap access to gpo and gpi to keep track of the previous brightness, etc. Thank you!

[bradgrantham]

Mind if I do this over the weekend while you're gone?

[lkesteloot]

Fine by me.

…

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