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Replace vtkOpenGLRenderWindow noise texture by blue noise

Gaspard Thevenon requested to merge gaspard.thevenon/vtk:blue-noise-renderer into master

Right now, vtkOpenGLRenderWindow uses a perlin noise texture as its noise texture (actually it is a white noise texture, but generated with a perlin noise generator). Moreover, it is only used in vtkOpenGLGPUVolumeRayCastMapper and in vtkSSAOPass. As a blue noise texture would be more suited, this MR replaces the noise texture used by a hard-coded blue noise texture.

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