[WIP] Adding CsWinRT projection for C# apps

[jonthysell]

Description

Type of Change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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Resolves [Add Relevant Issue Here]

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Microsoft Reviewers: Open in CodeFlow

[jonthysell]

This is paused until we can both strip out the uneeded xaml-based types in the fabric dll and also put both dlls into one nuget package.