FlightGear - Flight Simulator FGAddon

f-14b: use absolute paths for global properties in model animations

Model animation paths are resolved relative to the model root. For the
user's aircraft that is /, but for a multiplayer aircraft it is its
/ai/models/multiplayer[n] node, and for a submodel its
/ai/models/ballistic[n] node. Global properties such as /environment,
/sim/time and /sim/rendering do not exist under those nodes, so they
need the leading slash; the aircraft's own properties must stay
relative (see r20680).

- Cockpit wind speed/direction readouts now read /environment/wind-*
(previously read zero on remote aircraft).
- M61A1 smoke submodels now read /sim/time/elapsed-sec, so the puff
scale and fade animations run.

f-14b: fix case of Stores weapon folders to match model paths (AIM-54, AIM-7, AIM-9, MK-83)

dhc3: fix the transmission of variants over multiplayer again

Use the correct property /sim/model/variant, which is part of the multiplayer protocol,
to transmit the undercarriage: wheels=0, amphibious=1, floats=2, skis=3.

This re-applies revision 20679, mistakenly reverted and overwritten in r21721.

CRJ700-family: micro bug-fix: the fuel flow was incorrectly displayed in PpH instead of KpH.

De Havilland DHC 3 : Tail wheel animation (thanks to Ludovic Brenta). Slight correction to the AI ​​version.

De Havilland DHC 3 : Tail wheel animation (thanks to Ludovic Brenta). Slight correction to the AI ​​version.

De Havilland DHC 3 : Tail wheel animation (thanks to Ludovic Brenta). Slight correction to the AI ​​version.

Horten Ho IX : Better management of the MP protocol.

dhc3 : Better management of the MP protocol.

Horten Ho IX : Better management of the MP protocol.