Add GrowCut segmentation tool
Differential Revision: https://phabricator.mitk.org/D725
Co-authored-by: Jan Sarhage <j.sahrhage@dkfz-heidelberg.de>
Co-authored-by: Ralf Floca <r.floca@dkfz-heidelberg.de>
Co-authored-by: Amir Kalali <a.kalali@dkfz-heidelberg.de>