PNG: Simplified color parsing logic#3051
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I simplified the logic for parsing
png's color type + depth a little.I also removed
ApngDecoder'sanimatable_color_type. Not only areApngDecoderandPngDecodertightly coupled (meaning thatApngDecodershould be allowed to make assumptions aboutPngDecoder), but the implementation ofApngDecoderdoesn't actually use the assumption that decoded images are 8 bit or 16 bit. So it's doubly unnecessary.