Use GitHub Actions rather than Azure DevOps except macOS. #45

Job	Run time
test (x86-windows, windows, true)	52s
test (x64-windows, windows)	55s
test (x64-windows-static, windows)	5m 50s
test (x64-windows-static-md, windows)	5m 49s
test (x64-uwp, windows)	5m 50s
test (arm64-windows, windows)	56s
test (arm64-uwp, windows)	56s
test (x64-linux, linux)	26s
test (arm-neon-android, android)	1m 34s
test (x64-android, android)	1m 29s
test (arm64-android, android)	1m 41s
	26m 18s

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