IMC: Added ArduPilotMotorControl message

IMC: Added ArdupilotPwm message

IMC: Autogenerated files
CMake: Added a target to create startup-scripts for Flightgear
Simulators.Multicopter: Added simulator task for multicopters
Transports.ArdupilotSITL: Added a task to be an interface between an APM SIL simulation and Dune
Flightgear: Added option to generate ardupilot pwm input signals
UserInterfaces.RCViaArdupilot: Added a taks to enable an SPM to be used as an RC input device