Mixedrealitytoolkit-unity: MRTK script compilation errors when Microsoft.Windows.MixedReality.DotnetWinRT package is installed

[dfields-msft]

Describe the bug

After installing both MRTK and Microsoft.Windows.MixedReality.DotnetWinRT, script compilation errors occur in MRTK scripts due to references to the Windows namespace. This occurs because the scripts themselves exist inside the Microsoft top-level namespace, so bare references to the Windows namespace within the scripts will bind against the Windows subnamespace from Microsoft.Windows.MixedReality.DotnetWinRT rather than the global Windows namespace. The fix is to qualify these references with global::.

To reproduce

Steps to reproduce the behavior:

1. Install MRTK
2. Install Microsoft.Windows.MixedReality.DotnetWinRT per documentation
3. Wait for Unity to recompile scripts
4. Observe script compilation errors in the Output window due to missing types in the Microsoft.Windows namespace.

Expected behavior

No compilation errors when both packages are installed.

Screenshots

Your Setup (please complete the following information)

• Unity Version 2019.2.11f1
• MRTK Version 2.1

Target Platform (please complete the following information)

• HoloLens
• HoloLens 2
• WMR immersive

Additional context

I believe this conflict has already been addressed in the changes to consume MRTK as a NuGet package, but this fix is needed independent of that so that even consumers who aren't using the NuGet package to acquire MRTK itself can still successfully use Microsoft.Windows.MixedReality.DotnetWinRT and other related packages like Microsoft.MixedReality.QR and Microsoft.MixedReality.SceneUnderstanding.

[dfields-msft]

@keveleigh @davidkline-ms FYI.

[keveleigh]

The Storage fixes went in with #6147

[davidkline-ms]

Confirmed this has been resolved in 2.2.0 via #6147