Update for 4.0 releases

ArduPIlot Follow Me setup

Fix correct usage of heading value

Stream HOME_POSITION on ArduPilot

Allow unknown flight modes without warning

Finish up follow me support

Plugin'ized follow me support

Correct description

Enable ArduPilot motor testing

Remove firmware version type since official always

Use firmware version type, not vehicle type

qobject_cast is times faster dynamic_cast for objects that
inherit QObject. also, use auto keyword to not duplicate
class names.