* Add MSBuildSDK nuget package
* Use .proj files to get cpp dependencies, build metadata tools
* Use dotnet tool version of clangsharp tool instead of checked in binaries
* Fix projects to use latest version of System.CommandLine
* Consolidate into a single baseline winmd
* Cache the compiled headers in a .zip
Co-authored-by: Steve Otteson <sotteson@microsoft.com>
Steve Otteson