Emscripten build

Update ImGui MacOS implementation #962

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Run time

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Job	Run time
Win10 -> Emscripten, Debug	19m 0s
MacOS -> Emscripten, Debug	7m 39s
Linux -> Emscripten, Debug	14m 20s
Linux -> Emscripten, Release	15m 8s
Win10 -> Emscripten, Release	20m 13s
	1h 16m 20s