This commit moves the steering output from yaw to the roll channel to better reflect the lateral control input / reaction mapping. It also removes old unused parameters and modernizes the mainloop to remove unnecessary polling.
- the values of the parameters GND_MAX_ANG and GND_WHEEL_BASE are outdated. They belonged to another Rover setup.
- in the mixer file rover_diff_and_servo.main.mix the steering was controlled by roll, but in PX4 rover steering is controlled by yaw. And this was the reason why the attitude control did not work correctly
- the DF Robot GPX:Asurada rover has actual a steering angle of 60 degrees. And and wheel base of 0.17m. Parameter values in the airframe file are changed to this values