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Replace std::stringstream with vtkValueFromString in vtkVariant::ToX

Alexy Pellegrini requested to merge alexy.pellegrini/vtk:variant-conversions into master

Replace std::stringstream with vtkValueFromString in vtkVariant::ToX conversion functions, when the variant hold a string.
This will increase performances of all code that depends on these functions such as vtkStringToNumeric, vtkDelimitedTextReader and more.

The behavior is the same except that [-]infinity is no longer supported ([-]inf is still supported). Let me know if I should add an edge case to maintain the exact same behavior or if it was not used in practice.

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