Bug fix: the rqt GUI score subscriber was shutdown but not restarted
Bug fix: the rqt GUI score subscriber was shutdown but not restarted

The rqt GUI's score subscriber was previously initialized within the initPlugin function (which is called when the GUI first starts), then subsequently shutdown when the user clicks the "End Simulation" button. However, restarting the simulation by clicking "Build Simulation" did not reinitialize the subscriber, therefore the new scoring system stopped responding after a restart. This issue had been remedied by moving the score subscriber's initialization into the "Build Simulation" button event handler, immediately after the collection disk is inserted into the simulation, so that starts and subsequent restarts always trigger the subscriber's creation.

BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS,BCLab-UNM/SwarmBaseCode-ROS