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Emulate texture buffers with 2D textures

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:support-texture-buffers-gles into master

These changes emulate OpenGL texture buffers with 2D textures on OpenGL implementations that lack support for texture buffers. (GLES3.0 and below)

  • vtkOpenGLShaderCache patches glsl code to ensure texture buffers work as usual.
  • a unit test was written to verify emulation works correctly.
  • addresses #18788

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