Mixedrealitytoolkit-unity: The type or namespace name 'SpatialTracking' does not exist in the namespace 'UnityEngine'

[CDiaz-MS]

Describe the bug

On import of the latest 2.3 Foundation Unity package, the following errors come up:

Assets\MixedRealityToolkit.Providers\XRSDK\GenericXRSDKCameraSettings.cs(7,19): error CS0234: The type or namespace name 'SpatialTracking' does not exist in the namespace 'UnityEngine' (are you missing an assembly reference?)

Assets\MixedRealityToolkit.Providers\XRSDK\GenericXRSDKCameraSettings.cs(34,17): error CS0246: The type or namespace name 'TrackedPoseDriver' could not be found (are you missing a using directive or an assembly reference?)

To reproduce

Steps to reproduce the behavior:

1. Import the latest 2.3 test foundation package into Unity 2019.3.0f6

[Troy-Ferrell]

@keveleigh FYI

[Benji3199]

Same errors in Unity 2020.1.0a20.2541

[keveleigh]

Opened https://github.com/microsoft/MixedRealityToolkit-Unity/pull/7180 to fix this

[keveleigh]

Should be fixed via https://github.com/microsoft/MixedRealityToolkit-Unity/pull/7180