This mechanism automatically queues data into the correct thread where necessary, otherwise the method is invoked directly with low overhead.

At the same time remove the UDP socket event workaround. It is not a problem.

This way we don't need macro-magic to deal with
different operating systems and compilers.

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>

Removed incorrect Vehicle.altitudeWGS84

Plumb through initial object mode on Vehicle

Also additional major Mission usability changes

Added conditional statement to disable the virtualTabletJoystick output if a real joystick is connected and enabled. Without this, two different sets of values would be sent and would appear highly sporadic.

Also, added a missing method on AutoPilotPlugin as a public
pure virtual method (the inheritances already implemented it as a
slot, so the new Signal syntax didn't worked because the base class
didn't had that method)

Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>