- Introduces some minor things that help vtkParseProperties
  better wrap the `Data` property of vtkMatrix4x4 and vtkMatrix3x3.
- Since there was only a GetData and no SetData, it was not possible
  to obtain a setter for the `Data` property.
- Adds a new SetData(double*) method to set the elements.
- Adds missing VTK_SIZEHINT macro for vtkMatrix4x4::GetData()