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Fix point size bug in charts with GLES 3.0

Jaswant Panchumarti (Kitware) requested to merge jaswant.panchumarti/vtk:fix-point-size-in-charts-gles-emscripten into master

vtkglPointSize does not change point size for GLES 3.0 because glPointSize is absent. To overcome this problem, set gl_PointSize from the vertex shader. The value of gl_PointSize is initialized by a uniform equivalent to the pen's width.

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