Refactoring to separate 2D and 3D body pose estimation support.

Assets/Scenes/HumanSegmentation/HumanBodyTracking2D.unity

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+  m_HumanBodyPose3DEstimationEnabled: 0
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   m_HumanBodyPrefab: {fileID: 0}

Assets/Scenes/HumanSegmentation/HumanBodyTracking3D.unity

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+  m_HumanBodyPose2DEstimationEnabled: 0
+  m_HumanBodyPose3DEstimationEnabled: 1
   m_HumanSegmentationStencilMode: 0
   m_HumanSegmentationDepthMode: 0
   m_HumanBodyPrefab: {fileID: 1934569588295450, guid: b34b6c8f1206a6844b983e23b9da0441,

Assets/Scenes/HumanSegmentation/HumanSegmentationImages.unity

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