fix hardcoded start of fgfs and terrasync, use system environment variables for linux distro independence

First stab at JSBSim interface, compiling, operational, but needs the correct startup folders and arguments

fix hardcoded start of fgfs and terrasync, use system environment variables for linux distro independence

archlinux compatibility

First, stupid, naive version of PX4 uploader, needs testing and cross-platform fixes. Compiles, ready for testing

Hil flightgear

Changed default MAVLink messages back to nothing from "pixhawk"

The HSIDisplay widget now displays all types of waypoints.

Small fix to ControlWidget

Fixed mistype in file name.

Fix image stream receive counter reset bug

FlightGear HIL Improvements

Phonon broken include for Linux