This is a recreation of #1392 which became stale and contained too many conflicts as a result of Josh rewriting history. As #1391 clearly points out, LodePNG is slow and not generally available in most package managers.

Hey! I think I know how to set up Mac now! The only issue I'm having is related to our use of LodePNG, so once this gets merged, I can finally test out my latest pr! :D

Closing in favor of #1548 which is cleaner, faster, and more complete.