ENH: Additional costructor slice widgets
Hi,
I'd like to add the submitted constructors in the classes qMRMLSliceWidget and qMRMLSliceControllerWidget. In this way I can heridate the private calsses for custom widgets, then registered using the factory as described in https://github.com/Slicer/Slicer/pull/309#issuecomment-142910132 .
@jcfr may you take a look?