COMP: Remove unused "vtkSlicerROILogic" class

Not user anywhere. This class was originally used by vtkSlicerROIGUI
which has been removed with r16260.

"API changes Roadmap" wiki page has also been updated.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@21744 3bd1e089-480b-0410-8dfb-8563597acbee