FlightGear - Flight Simulator FGAddon

Diamond-Da42: we have Diesel engines, so no spark plugs or magnetos. Make the two
engine master switches toggle the "magnetos" for the YASim FDM.

ATR-72-500: bug fix: honor the option to show or hide landing and taxi light cones

Models/Lights/landing-stbd.xml: delete.
Models/Lights/landing-port.xml: rename to landing.xml and use a parameter property.
Apply the select animations to the Cone-texture object too; this fixes the bug.
Models/ATR-72-500.xml: use an overlay to pass the appropriate property as parameter.
Models/Lights/taxi.xml: apply the select animations to the Cone-texture object too.

ATR-72-500: add the max take-off weight to the fuel and payload dialog

ATR-72-500: remove lights from the preview of fgrun

DR400-dauphin: change engines for realism. Add MTOW to the fuel & payload dialog.

The "DR400 Dauphin 4" has a 160-hp O-320 engine; the 180-hp O-360
engine is offered only on the higher-end DR400 Regent, along with a
higher MTOW.

DR400-dauphin: Nasal/electrical.nas (update_electrical_system):
correct the value of dt, it would always be equal to
/sim/time/elapsed, resulting in the battery discharging in a fraction
of a second after sufficient time had elapsed and making it impossible
to restart the engine after landing and shutting down.

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small mesh updates

Remove the stall initiator code, it's unnecessary for the Ercoupe