Emscripten build

Appveyor: use Windows SDK 10.0.17763.0 #1477

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Run time

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Job	Run time
Linux -> Emscripten, Release	41m 9s
Linux -> Emscripten, Debug	17m 2s
Win10 -> Emscripten, Release	28m 44s
Win10 -> Emscripten, Debug	23m 37s
MacOS -> Emscripten, Debug	14m 43s
	2h 5m 15s