[BUG] MRTKDevTemplate project configuration incompatible with Unity 6 + URP

[whebertML]

Describe the bug

When opening the MRTKDevTemplate project, feature/XRI3 branch, with Unity 6 and adding the URP package, the following compile errors are seen:

This is remedied by updating the graphics tools package to version 0.7.0 or later. Should we go ahead and update the MRTKDevTmplate project (feature/XRI branch) to a more recent version of com.microsoft.mrtk.graphicstools.unity to allow for Unity 6 + URP out of the box?

To reproduce

Steps to reproduce the behavior:

1. Open the feature/XRI3 in Unity 6
2. Add the URP package

Expected behavior

The MRTKDevTemplate sample project not only works in Unity 6, but is compatible when also switching to URP in Unity 6.

Your setup (please complete the following information)

• Unity Version 6000.0.25f1
• MRTK Version or Commit [v4.0.0]

Target platform (please complete the following information)

• HoloLens 2
• Magic Leap
• OpenXR

[AMollis]

@AMollis will follow-up with Mixed Reality Graphics team and will publish MRGT to the Unity Asset Store and NPM feed.

@whebertML will update MRTK3's XRI branch with the latest MRGT package that supports Unity 6.

@jackiecurley and @whitetigerhelix have the contacts for MRGT. Please follow-up with Jackie and Chris on MRGT status.

[jackiecurley]

Issue was fixed in October: microsoft/MixedReality-GraphicsTools-Unity#224 So if we update the MRTKDevTemplate to MRGT 0.7.3+ that should resolve the issue.