see #josm7777 - add new shelter icons + optimization

git-svn-id: http://svn.openstreetmap.org/applications/share/map-icons@30648 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4
see #josm7093 - add new traffic_calming icon + optimization

git-svn-id: http://svn.openstreetmap.org/applications/share/map-icons@30649 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4