Refactor VolumeVisualization plugin to use the new node selection widgets
Summary:
Reorder functions and includes, fix formatting, remove unnecessary comments, includes and properties
Add a single node selection widget
Remove unnecessary includes
Test Plan: manual testing
Reviewers: floca, O3 MITK Reviewer Group II
Reviewed By: floca, O3 MITK Reviewer Group II
Subscribers: kalali, floca
Maniphest Tasks: T27556
Differential Revision: https://phabricator.mitk.org/D349