armem_robot_state: updates

Changes:

• RobotReader: implemented getRobotJointState
• VirtualRobotReader: synchronizing robot when new one is requested
• new class VirtualRobotHelper that provides additional information e.g RobotInfoNode that is not part of the VirtualRobot::Robot data structure

source/RobotAPI/components/ArViz/Client/Elements.h

@@ -122,6 +122,13 @@ namespace armarx::viz
         )
             : Box(name, b)
         {}
+
+        Box(std::string const& id)
+            : ElementOps(id)
+        {
+            pose(Eigen::Matrix4f::Identity());
+        }
+
     };