Added ASLUAV autopilot message set (http://www.asl.ethz.ch), removed senseSoar message set

See commit messages below. 

It was also verified that even older version of the QGroundControl-station, which still have senseSoar-related code inside, will still compile correctly when the senseSoar mavlink message set is removed. A separate Pull Request for removing the actual senseSoar-related code in QGrouncControl will follow.