Common project

## DO NOT MERGE (yet)

This pull request should not be merged until the NuGet dependency on [**Microsoft.VisualStudio.Project.10.0**](https://www.nuget.org/packages/Microsoft.VisualStudio.Project.10.0) is updated to a final release.

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This pull request updates the project system used by SHFB within Visual Studio to use the common project system derived from the various MPFProj projects.