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@robmen I do have a couple of particular questions about this PR when you have a moment.

1. Is the testing sufficient? What additional coverage would you like, more OutputTypes, more variations, or something included in WixE2E?
2. I couldn't find documentation on current error codes, so I picked WIX9000 and WIX9001 for these new MSBuild-related errors as a placeholder.

Thanks but this copies in way too much code from the .NET project system. We'll need to find another way to share with them vs. copying in that much of their code.