Merge branch 'Modernise_Rendering' into 'master'

src/Cxx/Rendering/AmbientSpheres.cxx

src/Cxx/Rendering/AmbientSpheres.md

src/Cxx/Rendering/CameraBlur.cxx

src/Cxx/Rendering/CameraBlur.md

src/Cxx/Rendering/ColoredSphere.cxx

src/Cxx/Rendering/ColoredSphere.md

src/Cxx/Rendering/Cone3.cxx

src/Cxx/Rendering/Cone3.md

src/Cxx/Rendering/Cone4.cxx

src/Cxx/Rendering/Cone4.md

src/Cxx/Rendering/DiffuseSpheres.cxx

src/Cxx/Rendering/DiffuseSpheres.md

src/Cxx/Rendering/FlatVersusGouraud.cxx

src/Cxx/Rendering/FlatVersusGouraud.md

src/Cxx/Rendering/HiddenLineRemoval.cxx

src/Cxx/Rendering/InterpolateCamera.cxx

src/Cxx/Rendering/Mace.cxx

src/Cxx/Rendering/Mace.md

src/Cxx/Rendering/Model.cxx

src/Cxx/Rendering/Model.md