Overload setters of vtkFunctionParser
The goal of this MR is to:
- overload setters in
vtkFunctionParser
- remove const from
GetSelectedVectorComponents(int i)
- remove redundant conversions from std::string to const char * in
vtkArrayCalculator
using the new overloads
The redundant conversions were detected from https://open.cdash.org/viewBuildError.php?type=1&buildid=7405498