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[E2] PNG Core

Ever wanted to write images in your chips? Maybe for a raytracer, radar scanner? Could even make MS Paint? There's a tool for that!

```
local Png = png(2, 2, _PNG_RGB)
Png:write(255, 0, 0)
Png:write(0, 0, 255)
Png:write(0, 255, 0)
Png:write(255, 255, 255)

assert(Png:done(), "PNG wasn't done writing!")

fileWrite("foo.png", Png:output())
```