Emscripten build

Core: a few minor fixes #1454

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Run time

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Job	Run time
Win10 -> Emscripten, Release	27m 33s
Win10 -> Emscripten, Debug	21m 28s
Linux -> Emscripten, Release	41m 18s
Linux -> Emscripten, Debug	16m 58s
MacOS -> Emscripten, Debug	15m 55s
	2h 3m 12s