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/Client.h

@@ -51,7 +51,7 @@ namespace armarx::viz
 
         // ////////////////////////////////////////////////////////////////// //
         //layer
-        Layer layer(std::string const& name) const
+        virtual Layer layer(std::string const& name) const
         {
             return Layer(componentName, name);
         }