Quadrotor HILS Update

This pull request includes modifications for Quadrotor HILS using XPlane + QRO model.
I did followings

- Order of motors has been determined by trial-error (turn on/off motors one-by-one)
  https://docs.google.com/drawings/d/1sqhJYAbvFllVjniTacfGQO82go57PRmCcZcCrgn--sY/edit?usp=sharing

- Modify updateControls to control both fixed-wing aircraft and quadrotor. Hexa, Octa are not supported for now.

- MAVLINK_MSG_ID_SERVO_OUTPUT_RAW has been disabled since it is not required for HILS.