Logic can observe transformable nodes, and set attributes to slice nodes.
Volume reslice functions implemented in logic.
Logic controlled by GUI.
Reslicing starts automatically after reloading a scene.
Cleanup unnecessary code.
Widget interactions make effect immediately.
WIP: Show correct state in the Widget after loading a scene before the Widget is created.
Widget gets updated from reloaded scene, even if not yet created when the scene is loaded.
Merge pull request #6 from ungi/master

VolumeResliceDriver Logic-based implementation