Added basic infrastructure for container actions (RAVE-1056)

git-svn-id: http://svn.apache.org/repos/asf/rave/trunk@1523056 13f79535-47bb-0310-9956-ffa450edef68
Added container actions for widget title bar (RAVE-1056

git-svn-id: http://svn.apache.org/repos/asf/rave/trunk@1523169 13f79535-47bb-0310-9956-ffa450edef68
Changed gadget to widget in paths (RAVE-1056)

git-svn-id: http://svn.apache.org/repos/asf/rave/trunk@1523171 13f79535-47bb-0310-9956-ffa450edef68