Remove unused segmentation tool classes
Test Plan: nothing to test
Reviewers: kislinsk, O1 MITK Reviewer Group I, floca
Reviewed By: kislinsk, O1 MITK Reviewer Group I, floca
Subscribers: floca, kalali, kislinsk
Maniphest Tasks: T29145
Differential Revision: https://phabricator.mitk.org/D634