Fixed stochastic jittering and added API to customize noise settings.
The mapper uses vtkPerlinNoise by default with a texture size and frequency equivalent to the window size. It is possible to fully customize the noise generator and texture size. UseJittering changed to be off by default so some of the baselines were updated. Added tests for both default and customized noise ray jittering. Disabled TestGPURayCastMapperSampleDistance in legacy OpenGL.
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