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

name element of mavlink_named_value is uint8_t

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

Cleaned up serial link handling, eliminated double menu entries and safeguarded the link list. Did intentionally not improve the object dependency issue, will work on that on a global scope

Working on better simulation implementation, fixed a bug where the port handle was not fully released