STYLE: Remove VTKv5 support
Created by: jcfr
As discussed during the developer hangout of 2015-03-31, this commit removes support for VTKv5.
Most of the h/cxx files have been updated automatically using the script "slicer_remove_vtk5_support.py" [1]. See below.
The remaining of h/cxx, python and CMake files have been updated manually.
slicer_remove_vtk5_support.py:
cd ~/Project/Slicer
~/Download/slicer_remove_vtk5_support.py $(ack -l VTK_MAJOR_VERSION)