FlightGear - Flight Simulator FGAddon

Mosquito: remove the gunsight from the bomber, keep it only in the fighter-bomber.

Mosquito B mk XVI: remove one redundant pair of propellers from the model.

Lockheed1049h: normalize all property names *not* to start with a slash.

Thanks to Emilian for the explanation.
Closes: https://sourceforge.net/p/flightgear/tickets/4/

Lockheed1049h: repair animations over multiplayer

Thanks to Emilian for reporting the bug so quickly and for the
detailed explanation.
Closes: https://sourceforge.net/p/flightgear/tickets/4/

Mosquito:
* Bug fix: make the cockpit instruments appear in the bomber variant.
* Bug fix: make the RPM indicator needles rotate correctly.
* Models/Instruments/ignition-gb/ignition[12].xml: factorize into ignition.xml.
* Models/Instruments/rpm-[ps].xml: factorize into rpm.xml.
* mosquito-common.xml: new; factorize most of the mosquito model.
Do not start with engines running; }}s works.
Add a rating.
* mosquito-fbVI-set.xml, mosquito-set.xml: include the above.
* Models/cockpit.xml: bug fix: relocate the beam_approach instrument to make
it visible.
* Models/Instruments/rpm5k-gb/*: delete, redundant with rpm.*

mosquito:
* Make all paths relative.
* Normalize the indentation of all XML files.

Lockheed1049h: revert the part of the previous commit inside <aerodynamics>

It seems JSBSim does not in fact support property names starting with a slash.

Lockheed1049h: normalize property names always to start with a slash.

Lockheed1049h: no more rain or snow in the cockpit

Import selected improvements from the Lake of Constance version (1.3.0) of
the Lockheed1049h. This fixes an old bug whereby rain and snow would pour
inside the cockpit.

* Models/Lockheed1049h_Panels.xml,
Panels/panel_eng_crossfeed.xml,
Panels/panel_eng_fuelvalves.xml,
Panels/panel_eng_levers.xml,
Panels/panel_eng_levers2.xml,
Panels/panel_overhead_fuel.xml,
Panels/panel_pilot_side_lower.xml,
Panels/panel_pilot_side_upper.xml: delete.
* Models/Lockheed1049h_Cockpit.xml: do not load the panels anymore.
* Models/Instruments/fuel_C.xml,
Models/Instruments/fuel_L_inboard.xml,
Models/Instruments/fuel_L_middle.xml,
Models/Instruments/fuel_L_outboard.xml,
Models/Instruments/fuel_R_inboard.xml,
Models/Instruments/fuel_R_middle.xml,
Models/Instruments/fuel_R_outboard.xml: add pick animations on the faces
of the gauges, to increase or decrease fuel levels; replacing the 2D panel.
* Models/Instruments/landing_gear.xml,
Models/Instruments/parking_brake_cp.xml,
Models/Instruments/parking_brake_p.xml,
Models/Instruments/prop_reversing.xml: require electricity on the bus.
* Models/Instruments/terrain_warning.xml: illuminate lamps.

Lockheed1049h: re-model the engines completely for better historical accuracy

The modeling of the engines was a bit inaccurate, partly because of
inconsistent data sources and partly due to old limitations of JSBsim.
This new model uses consistent historical data, assuming 135/145 octane
fuel which is no longer available anywhere. The data used to tune the
model are included with references.