Add CookFlavor property for projects. #76

Job	Run time
Test StringEnum Trimmed	29s
Timestamp	6s
Build Mac Logging	30s
Build AutoDiscovery	53s
Build Libraries on macOS	5m 9s
Build macOS Pass 1	4m 41s
Build Windows Pass 1	8m 9s
Build and Test Libraries on Windows	9m 2s
Build macOS Shim	39s
Build Windows Shim	53s
Build macOS UEFS	1m 34s
Build Windows UEFS	3m 6s
Build Windows Pass 2	7m 58s
Build macOS Pass 2	5m 0s
Publish to NuGet	0s
Publish UEFS Container	0s
Publish to GitHub	0s
	48m 9s

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