Polish new MRTK3 Learning Path code and create pre-release versions packages

[AMollis]

This issue has been migrated a new MRTK repository, and the status of this issue will now be tracked at the following location:

• Polish new MRTK3 Learning Path code and create pre-release versions packages MixedRealityToolkit/MixedRealityToolkit-Unity#69

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Overview

The new MRTK3 learning paths utilize custom .unitypackages that should be posted at https://github.com/microsoft/MixedRealityLearning/releases.

Before we can pre-release these custom packages, we need to polish the code for these code packages

• MRTK.Tutorials.GettingStarted
• MRTK.Tutorials.PCHolographicRemoting
• MRTK.Tutorials.AzureSpatialAnchors
• MRTK.Tutorials.AzureCloudServices

Once code is polished, we need to create the .unitypackages and post them to https://github.com/microsoft/MixedRealityLearning/releases/ as version 3.0.0-pre.1

Dependencies

• Depends On: Create sample Unity project with completed scenes for MRTK3 Learning Paths #11674

Tasks

• Update MRTK3 packages to new org.mixedrealitytoolkit pre.18 packages
• Update namespaces to new non-Microsoft namespaces.
• Make sure pre-release packages use latest public MRTK3 pre-release
• Add MIT license
• Verify code can be used in a sample app (depends on Create sample Unity project with completed scenes for MRTK3 Learning Paths #11674)
• Create pre-release packages for each of the four packages, versioning as 3.0.0-pre.1, and post to https://github.com/microsoft/MixedRealityLearning/releases/