some cleanup of the viewer
some cleanup of the viewer

peteflorence/crazyflie-tools,peteflorence/crazyflie-tools,blandry/crazyflie-tools,blandry/crazyflie-tools,blandry/crazyflie-tools,peteflorence/crazyflie-tools,blandry/crazyflie-tools,peteflorence/crazyflie-tools