Fix issues:

+ improve formatting
+ remove superfluous semicolons
+ comment unused parameters
+ rename Initialisation to Initialization
+ rename Deinitialisation to Finalization
+ remove spaces

src/Gui/ViewProviderGeoFeatureGroupExtension.cpp

@@ -97,4 +97,4 @@ EXTENSION_PROPERTY_SOURCE_TEMPLATE(Gui::ViewProviderGeoFeatureGroupExtensionPyth
 
 // explicit template instantiation
 template class GuiExport ViewProviderExtensionPythonT<ViewProviderGeoFeatureGroupExtension>;
-}
+}