Automated MxN layout from data
Summary: Added an option in the layout selection of the MxN widget to set the layout based on a selection of data nodes. For each node, a row of 3 windows (one for each view direction) is added to the layout. Solves T30266. Could be expanded further to more features (T30389), this is a MVP for now.
Test Plan: Load some images, close StdMultiWidget and open MxN. Open the layout widget in the toolbar on the right, and select "Data-based layout" and try it out.
Reviewers: O1 MITK Reviewer Group I, O3 MITK Reviewer Group II, kislinsk
Reviewed By: O1 MITK Reviewer Group I, O3 MITK Reviewer Group II, kislinsk
Subscribers: kislinsk
Differential Revision: https://phabricator.mitk.org/D914