Also allows us to re-add -fvisibility=hidden to Linux builds
meh.
libpixel (suprisingly) still compiles, but depends on libraries in a very annoying manner that makes EuropaTools hard to compile. Also, I don't like stb_image_write. Replace it with some hand-done structs and the simpler/faster/better `lodepng`.
europa::io::yatf
Finish Refactoring™️