Draft: WIP: Holographic Remoting

Rebased version of !8101 (closed)

Master issue updated to track remaining tasks and progress. Here are details about the main technical points to address before merging.

• Split OpenGL/D3D implementation:

  • vtkOpenXrManager: Strategy design pattern. Implementation set at runtime by OpenXRRenderWindow.
  • vtkOpenXRRenderWindow: Introduce Remoting subclass to override behavior

• CMake:

  • Microsoft.Holographic.Remoting.OpenXr nuget package: FindOpenXRRemoting vs VS_PACKAGE_REFERENCES.
  • Introduce VTK_OPENXR_REMOTING to conditionally include changes in common files.