Strip invalid PNG profiles from PNGs
Bad PNGs caused a few annoying warnings like “libpng warning: iCCP: known incorrect sRGB profile”.
Command used:
pngcrush -rem gAMA -rem cHRM -rem iCCP -rem sRGB
Note that many images have “@2x” in their name, this probably explains why they have been overlooked before.
sky = 179, 243, 243
border = 128, 128, 128
music = Nature.ogg
clouds = 0
flakes = 0, 0, 0, 0, 0