Plus other auto connect bug fixes

I removed some needed headers from a top level file which then causes a
ripple effect downstream

Removed incorrect Vehicle.altitudeWGS84

Plumb through initial object mode on Vehicle

Also additional major Mission usability changes

- Also fix vehicle selector dropdown in toolbar

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>