Added a service to set the car lights.

Added an OFF option to the set_semaphore service.

srv/set_car_lights.srv

+uint8 CAR_OFF = 0
+uint8 CAR_NORMAL_DRIVE = 1
+uint8 CAR_BRAKE = 2
+uint8 CAR_TURN_LEFT = 3
+uint8 CAR_TURN_RIGHT = 4
+uint8 CAR_PARKED = 5
+uint8 CAR_EMERGENCY = 6
+uint8 CAR_AMBULANCE = 7
+uint8 CAR_CHARGING = 8
+
+uint8 lights
+---
+