FlightGear - Flight Simulator FGAddon

Harrier-GR3/Nasal/autohover.nas: improve vertical control.

We now use pitch angle, nozzles angle and roll angle to calculate vertical
component of current thrust, which improves behaviour when these angles change
rapidly.

For example this avoids temporary too-low thrust when nozzles are moved to
point forwards to slow down.

Harrier-GR3/Nasal/autohover.nas: simplified timer wrappers.

Don't try to rename built-in setlistener() etc, but instead have our own
autohover_setlistener() which takes care of cleaning up if we reload.

Harrier-GR3/Systems/Autopilot.xml: set startup-current=true to reduce startup oscillations.

CargoTowingAddon: Scale bambi bucket on fill, more particle tuning, spout animation on release

Wildfire: More editing effects textures

CargoTowingAddon: Bambi bucket texture, bucket fill logic bug, tuning drop particles, wildfire tie-in

North American T6 Texan: Nasal correction, thanks to Julian Smith for his help.

CargoTowingAddon: New Bambi bucket, start retardant submodel logic

CargoTowingAddon: Bambi bucket water drop particle effect

CargoTowingAddon: Fill and release Bambi bucket logic