implement OM int histograms

OpenMesh/OMPropertyVisualizerIntegerT_impl.hh

@@ -61,6 +61,8 @@ OMPropertyVisualizerInteger<MeshT, T>::OMPropertyVisualizerInteger(MeshT* _mesh,
         w->intAbsolute->setChecked(false); //because we already have unsigned integers wo don't have to calculate their absolute value
         w->intAbsolute->setCheckable(false);
     }
+    this->connect(w->computeHistogramButton, &QPushButton::clicked,
+                  [this, w](){this->template showHistogram<T>(w->histogram);});
 }
 
 template <typename MeshT,typename T>