Refactor PointSet Interaction plugin to use the new node selection widgets

Summary:
Some refactoring / re-design has been done as a first step.
After that a single node selection widget has been added that accepts data nodes of type PointSet.

Test Plan: manual GUI test

Reviewers: floca, O3 MITK Reviewer Group II

Reviewed By: floca, O3 MITK Reviewer Group II

Subscribers: kalali, floca

Tags: PHID-PROJ-rugimqq4skxnoty3nj5g

Differential Revision: https://phabricator.mitk.org/D328