Update points parser for VTK Loader

Some vtk files don't have float numbers in POINTS section.
They are int numbers. For example, parse wants:
0.0 1.5 2.0
But came:
0 1.5 2
In previos implementation parse pattern don't parse
This fix remove part after "." in number, and search will work
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I would like to have more for VTK in Three.js