ImageReader, TextureLoader : Remove special case for png colorspaces #1867

Job	Run time
build (windows-platform25)	28m 12s
build (linux-debug-platform25)	18m 26s
build (windows-debug-platform25)	23m 19s
build (linux-platform24)	18m 17s
build (linux-platform25)	17m 49s
build (macos-platform25)	12m 27s
	1h 58m 30s

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