Updating CPP code.

Andrew Macleanrequested to merge
(removed):updating_cpp_code into master

Code has been reformatted and tested to ensure it compiles against the VTK master. Where colors were specified by floats color names are now used.

The C++ code now uses vtkNew() and auto.

Using vtkNew() for two reasons:

  1. As a teaching tool it makes it simpler and easier for people to write/understand the code.
  2. The code layout looks much neater. vtkNew is sufficiently distinctive so it highlights the vtk specific declaration.
Edited by Andrew Maclean

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