Use GitHub Actions rather than Azure DevOps except macOS. #46

Job	Run time
test (x86-windows, windows, true)	25m 37s
test (x64-windows, windows)	25m 42s
test (x64-windows-static, windows)	25m 41s
test (x64-windows-static-md, windows)	25m 41s
test (x64-uwp, windows)	25m 42s
test (arm64-windows, windows)	25m 43s
test (arm64-uwp, windows)	25m 48s
test (x64-linux, linux)	24m 38s
test (arm-neon-android, android)	26m 19s
test (x64-android, android)	26m 15s
test (arm64-android, android)	26m 14s
	4h 43m 20s

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