Emscripten build

Add capability of creating seperated stencil view in OpenGL. #3437

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Run time

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Job	Run time
MacOS -> Emscripten, Debug	10m 25s
Linux -> Emscripten, Release	18m 24s
Win10 -> Emscripten, Debug	19m 43s
Win10 -> Emscripten, Release	25m 30s
Linux -> Emscripten, Debug	15m 26s
	1h 29m 28s