From Jordi Torres, added ref_ptr<> usage to quieten cppcheck false positive
From Jordi Torres, added ref_ptr<> usage to quieten cppcheck false positive

openscenegraph/osg,openscenegraph/osg,scrawl/osg,scrawl/osg,scrawl/osg,openscenegraph/osg,scrawl/osg,openscenegraph/osg