[vtkusers] Update Subimage (glTexSubImage3D, glTexSubImage2D)

[Jacob Foshee]

Hello, all,

Does VTK support updating a subimage via glTexSubImage*D?

Searching the code, I find this only in FreeType (FTTextureGlyph.cpp) and in
vtkOpenGLImageActor::Load(vtkRenderer *ren).  It does not appear to be a
general option for updating part of an existing texture.

Is there anyone using VTK in this way?  I need high-speed update of texture
memory.

Thanks!
Jacob
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