Investigate VTK8 patches for VTK 9 (vtkOpenglSphereMapper, vtkOpenFoamReader)

[biagas]

There were patches for the vtkOpenGLSphereMapper and vtkOpenFoamReader classes with VTK 8.
The code base changed significantly enough it couldn't be easily determined if a patch was still needed.

These should be investigated, and new patches created if needed.

• [ ] vtkOpenGLSphereMapper
• vtkOpenFOAMReader

[biagas]

vtkOpenGLSphereMapper : seems to not need a patch with 9.2.6.
When rendering point meshes whose coordinates are very large or very small, and using the 'Sphere' glyph type (sphere imposters), the PointSize must match the scale of the coordinates. An Auto point size would be helpful in these instances. See #18818

[biagas]

vtkOpenFOAMReader patches not needed. We have our own. They need updating, however. Will open a new ticket for that.