Use override/final/=delete anytime the compiler supports them
This makes the VTK_USE_CXX11_FEATURES a flag that sets the CMAKE_CXX_STANDARD and CMAKE_CXX_STANDARD_REQUIRED flags rather than affecting vtkConfigure.h
This makes the VTK_USE_CXX11_FEATURES a flag that sets the CMAKE_CXX_STANDARD and CMAKE_CXX_STANDARD_REQUIRED flags rather than affecting vtkConfigure.h