Wrap LabelSetMeasures in LabelOverlapMeasuresImageFilter

[dzenanz]

This exposes the return value from itk::LabelOverlapMeasuresImageFilter::GetLabelSetMeasures() as a Python dictionary instead of <Swig Object of type 'std::unordered_map< unsigned char,itkLabelOverlapMeasuresImageFilterIUC3::LabelSetMeasures > *'>. This is needed for convenient use of the class from Python.

PR Checklist

• No API changes were made (or the changes have been approved)
• No major design changes were made (or the changes have been approved)
• Added Python wrapping to new files (if any) as described in ITK Software Guide Section 9.5

[dzenanz]

Currently running into:

3024: Loading ITKImageStatistics... done
3024: Running itkLabelOverlapMeasuresImageFilterIUC3... Running itkLabelOverlapMeasuresImageFilterIUC3... done
3024: done
3024: Traceback (most recent call last):
3024:   File "C:\Dev\ITK-git\Modules\Filtering\ImageStatistics\wrapping\test\itkLabelOverlapMeasuresImageFilterTest.py", line 33, in <module>
3024:     for label, measure in lsm.items():
3024:                           ^^^^^^^^^
3024: AttributeError: 'SwigPyObject' object has no attribute 'items'
3024: swig/python detected a memory leak of type 'std::unordered_map< unsigned char,itkLabelOverlapLabelSetMeasures,std::hash< unsigned char >,std::equal_to< unsigned char >,std::allocator< std::pair< unsigned char const,itkLabelOverlapLabelSetMeasures > > > *', no destructor found.
3024: itkTestDriver: Process exited with return value: 1

[thewtex]

What is dir(lsm)?

[dzenanz]

dir(lsm) is ['__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__int__', '__le__', '__lt__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', 'acquire', 'append', 'disown', 'next', 'own']

[thewtex]

@dzenanz could you please rebase and push? I am wondering if recent SWIG updates have helped.