Cherry-picked old changes: Remove-QmitkMouseModeSwitcher
Summary:
Modify replacing QmitkInteractionSchemeToolBar
Remove files
Fix wrong slot definition; use new connect-syntax
Test Plan: manual
Reviewers: s434n, O3 MITK Reviewer Group II
Reviewed By: s434n, O3 MITK Reviewer Group II
Subscribers: kalali
Maniphest Tasks: T24358
Differential Revision: https://phabricator.mitk.org/D536