Add CookFlavor property for projects. (#7) #83

Job	Run time
Test StringEnum Trimmed	36s
Timestamp	8s
Build Mac Logging	41s
Build AutoDiscovery	57s
Build Windows Pass 1	7m 57s
Build Libraries on macOS	5m 54s
Build macOS Pass 1	5m 20s
Build and Test Libraries on Windows	9m 22s
Build macOS Shim	38s
Build Windows Shim	1m 18s
Build macOS UEFS	1m 43s
Build Windows UEFS	3m 1s
Build macOS Pass 2	5m 10s
Build Windows Pass 2	7m 47s
Publish to NuGet	52s
Publish to GitHub	1m 17s
Publish UEFS Container	24s
	53m 5s

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