Modernising the code, improving images

src/Cxx/Visualization/ImageMapper.cxx

src/Cxx/Visualization/ImageOrder.cxx

src/Cxx/Visualization/ImageOrientation.cxx

src/Cxx/Visualization/ImageTransparency.cxx

src/Cxx/Visualization/IsosurfaceSampling.cxx

src/Cxx/Visualization/Kitchen.cxx

src/Cxx/Visualization/KochSnowflake.cxx

src/CxxHowTo.md

src/Python/Visualization/InteractorStyleTrackballActor.md

src/Python/Visualization/InteractorStyleTrackballActor.py

src/Python/Visualization/InteractorStyleTrackballCamera.py

src/Python/Visualization/Kitchen.py

src/Python/Visualization/KochSnowflake.py

src/Python/Visualization/VTKColorSeriesPatches.html

src/Python/Visualization/VTKNamedColorPatches.html

src/PythonHowTo.md

src/Testing/Baseline/Cxx/Visualization/TestImageMapper.png

src/Testing/Baseline/Cxx/Visualization/TestImageOrder.png

...sting/Baseline/Cxx/Visualization/TestImageOrientation.png

...ting/Baseline/Cxx/Visualization/TestImageTransparency.png