COMP: Support VTK 8.1 updating displayable manager to use vtkObjectFactory
Created by: jcfr
This commit introduces the CMake function "SlicerConfigureDisplayableManagerObjectFactory" used to configure VTK object factory allowing to instantiate displayable manager given the class name.
It updates SlicerMacroBuildModuleLogic and qSlicerExport.h.in so that the generated object factories are properly initialized.
It removes the use of vtkInstantiator that is deprecated following kitware/VTK@8328eda merged on 2017-09-26.
Co-authored-by: Jean-Baptiste Vimort jb.vimort@kitware.com