Use GitHub Actions rather than Azure DevOps except macOS. #47

Job	Run time
test (arm64-windows, windows)	16m 45s
test (arm64-windows-static-md, windows)	16m 40s
test (arm64-uwp, windows)	16m 43s
test (x86-windows, windows, true)	16m 34s
test (x64-windows, windows)	16m 38s
test (x64-windows-static, windows)	16m 38s
test (x64-windows-static-md, windows)	16m 37s
test (x64-uwp, windows)	16m 38s
test (x64-linux, linux)	15m 0s
test (arm-neon-android, android)	14m 54s
test (x64-android, android)	13m 21s
test (arm64-android, android)	17m 12s
	3h 13m 40s

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