WorldModel#initTeam(): also clean up old gamestate listeners
WorldModel#initTeam(): also clean up old gamestate listeners

magmaOffenburg/RoboViz,magmaOffenburg/RoboViz,pmacalpine/RoboViz,magmaOffenburg/RoboViz,pmacalpine/RoboViz,pmacalpine/RoboViz,magmaOffenburg/RoboViz