Remove new reinit overlay for StdMultiWidget

Summary:
Provide function to check for coupled render windows

React only if coupled render windows are found

This will disable the reaction on active tool changed for e.g.
the StdMultiWidget.

Add geometry comparison if coupled render windows are found

This will enable the geometry comparison for e.g. the StdMultiWidget.

Test Plan: manual testing

Reviewers: kislinsk, O1 MITK Reviewer Group I, O3 MITK Reviewer Group II

Reviewed By: kislinsk, O1 MITK Reviewer Group I, O3 MITK Reviewer Group II

Subscribers: kalali, kislinsk

Maniphest Tasks: T29367

Differential Revision: https://phabricator.mitk.org/D746