speed up GWT compiles by collapsing properties

Conflicts:
	features/topology-map/org.opennms.features.topology.app/src/main/java/org/opennms/features/topology/app/internal/gwt/TopologyAppWidgetSet.gwt.xml
	features/topology-map/org.opennms.features.topology.widgetset/src/main/java/org/opennms/features/topology/widgetset/gwt/TopologyWidgetset.gwt.xml
	features/topology-map/plugins/org.opennms.features.topology.plugins.ssh/src/main/java/org/opennms/features/topology/ssh/internal/gwt/TerminalWidgetSet.gwt.xml
	features/vaadin-dashboard/src/main/java/org/opennms/features/vaadin/dashboard/DashboardWidgetSet.gwt.xml
	features/vaadin-node-maps/src/main/java/org/opennms/features/vaadin/nodemaps/internal/gwt/NodeMapsWidgetset.gwt.xml