FlightGear - Flight Simulator FGAddon

bf109: assorted minor bug fixes

* Models/Instruments/shotcounter-ger/shotcounter-ger-m.xml: use the correct property.

* bf109g-yasim.xml: do not use full throttle for cruise; use 1.1 ata
manifold pressure instead, per the help. This brings the cruise
speed at 6000m from 220 KTAS to a more realistic 290 KTAS. Also,
lower throttle for approach.

Fix helper function bug, thanks C-FABP!

B-25 version 2.3: drop bombs; contribution by Alexandre Brenta.

* Models/explosion.xml,
Models/release.xml,
Models/smoke.png: copy from the B-24-Liberator and adjust.
* Systems/b25-keyboard.xml, Systems/help.xml (Ctrl+B): new key binding.
* Systems/views.xml (bombardier's view): adjust.
* b25-base.xml: bumb version number.

SUMPAC: Pilot weight to 224 lbs, horizon tape added to windscreen

Harrier-GR3:Models/Harrier-GR3.xml: stop fan spinning when engine is off.

Looks like engines/engine/n1 doesn't decay to zero when engine is off, so use
engines/engine/rpm instead for animation of fan.

PBY-Catalina: allow the user to ignire fires with Ctrl+Shift+Click.

* Inputs/sys_controls.nas: delete; it did nothing.
* Catalina-set.xml (nasal/init): ditto.
* Help/Catalina-help.xml: rewrite and reformat help.
Adjust key bindings to match those in the -set.xml.
* Systems/terrain.nas (terrain_survol): change from a settimer loop to maketimer.
(start_wildfire, wildfire_listener): new, adapted from
/usr/share/games/flightgear/Nasal/wildfire.nas.

Note: in 2019.1.1, wildfires are invisible; this is a known bug in fgfs and
not aircraft-side.

Bombardier-415: bug fix: add type information to view parameters; allows Model View to work again.

Harrier-GR3: Use 'C' to toggle canopy; 'c' now defaults to toggle cockpit view.

This restores default behaviour for 'c' in fgdata. Also updated help text for
'c' and 'C' accordingly.

Nasal/autohover.nas: update our window fonts if user changes gui style.

Harrier-GR3/Nasal/HUD.nas: don't show HUD if multiplayer view.