Move CI/CD to GitHub Actions #48

Job	Run time
Timestamp	5s
Test StringEnum Trimmed	52s
Build Mac Logging	33s
Build AutoDiscovery	1m 17s
Build macOS UEFS	1m 31s
Build macOS Shim	35s
Build and Test Libraries on Windows	9m 15s
Build Libraries on macOS	5m 27s
Build macOS Pass 1	5m 13s
Build Windows Pass 1	7m 52s
Build Windows UEFS	3m 3s
Build Windows Shim	58s
Build Windows Pass 2	8m 19s
Build macOS Pass 2	4m 49s
Publish to NuGet	0s
Publish to GitHub	0s
Publish UEFS Container	0s
	49m 49s

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