Wrap LabelSetMeasures in itkLabelOverlapMeasuresImageFilter

[phcerdan]

swig/python detected a memory leak of type 'std::unordered_map< unsigned char,itkLabelOverlapMeasuresImageFilterIUC3::LabelSetMeasures,std::hash< unsigned char >,std::equal_to< unsigned char > > *', no destructor found.

The struct LabelSetMeasures (internal to the filter) is not wrapped.

[stale]

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