FlightGear - Flight Simulator FGAddon

Harrier-GR3: bump version number to 3.3.

Revisions r3976 to r3990 are contributions by Julian Smith; I have
committed them on his belalf.

Harrier-GR3: auto-hover: moved AoA display down near to others.

Harrier-GR3; auto-hover: turn AoA off if xz control is activated.

Avoids fighting over nozzle angle.

Harrier-GR3: auto-hover AoA: use current AoA when activating.

Harrier-GR3: autohover AoA: also allow control via alt-x and alt-w.

These keys are easier to reach when landing than alt-insert/delete.

Harrier-GR3: autohover AoA: disable if weight on wheels.

Avoids unwanted accelerating after landing.

Harrier-GR3: auto-hover: use properties to store target height / vertical speed.

Also, don't override auto-hover properties that were pre-set by command line
--prop:<name>=<value>.

These changes for example allow target position/height to be set from command
line, becoming active after take off.

Harrier-GR3: auto-hover: hacky attempt to improve high-speed behaviour.

Harrier-GR3: autohover: hide windows properly when inactive.

Harrier-GR3: auto-hover: alt-/ targets current position.

Also made Alt-, cancel click targetting if pressed twice, and show text to
indicate next click will set target position.