Added new class to warp a vtkPointSet using MVC interpolation

This class uses Mean Value Coordinate interpolation to warp an
underlying vtkPointSet (e.g., vtkPolyData, etc.). It requires a
control mesh that is manipulated to effect the transformation.

Change-Id: If272bd9a3374acdb3b8b8e13e1fad346f6096694
Merge topic 'DeformPointSet' into master

1e7f2739 Added new class to warp a vtkPointSet using MVC interpolation