Refactoring WP interface, somewhat brittle and untested at this point - use the master branch if you need stable code right now

Made MAVLink parser aware of line breaks in comments, added new servo output packet to QGC and simulation, enabled servo output display in new Actuator View (previous Payload view)

Added angle conversion testing, added battery settings option, added option to set MAVLink ID of groundstation

Added right-click option to select MAV, ensured that waypoints get updated properly on switching MAV

Fully working waypoint interface, thoroughly tested. Active waypoint setting has to be debugged in the simulator, but works fine on real hardware