Switch from SimpleSinglePointerSelector to GazeManager in SpatialUnderstandingExample

Since SpatialUnderstandingExample uses a non-standard cursor, it's not compatible with SimpleSinglePointerSelector, so
for now, I disabled SimpleSinglePointerSelector and made InputManager auto-register the GazeManager as its pointer. If
the SpatialUnderstandingExample scene is updated to use a standard cursor in the future, someone can easily turn off
InputManager's GazeManager autoregistration and turn back on SimpleSinglePointerSelector to make it compatible with
6DoF controllers.

Author: Robert El-Soudani

Assets/HoloToolkit-Examples/SpatialUnderstanding/SpatialUnderstanding-FeatureOverview/Scenes/SpatialUnderstandingExample.unity

@@ -13,7 +13,7 @@ OcclusionCullingSettings:
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@@ -25,6 +25,7 @@ RenderSettings:
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@@ -53,7 +54,7 @@ LightmapSettings:
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     m_EnableRealtimeLightmaps: 1
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     m_TextureWidth: 1024
@@ -66,13 +67,27 @@ LightmapSettings:
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     m_ReflectionCompression: 2
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+    m_PVRFilteringAtrousPositionSigma: 1
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+  m_ShadowMaskMode: 2
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+    tileSize: 256
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 GameObject:
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@@ -2235,6 +2267,7 @@ Canvas:
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