FlightGear - Flight Simulator FGAddon

737NG: multiplayer bug fixes

* 737-ng-common-set.xml: send sim/liveries-path over mp as sim/multiplay/generic/string[0].
* 737-[6789]00-set.xml: Prefix sim/liveries-path with Aircraft/737NG.
* Models/737-model-common.xml (nasal/load): use the remote aircraft's string[0] as livery path.
(<model><path>): prefix with Aircraft/737NG to make the models load over mp.
* Systems/systems.nas (livery_update): remove the prefix, already in /sim/liveries-path.

Updated version 0.2.3

- Add: [#73] Autopush functionality
- Enhancement: [#62] Fuel pump low pressure light turns on when fuel tank is empty
- Enhancement: [#70][#71][#72]: Updating ground services and ground service dialog
- Enhancement: [#76] Gear is not longer retractable while on ground
- Enhancement: Couple ground steering with rudder. Removed steering tiller dialog

J3Cub: More stec 55 installation

J3Cub: Start stec 55 installation, refactor snow depth and ground sink logic, gear skid animation, particle effect light dynamics

J3Cub: Bug in float determination logic

Harrier-GR3: bug fixes: animate the ASI needle correctly and do not use float[6] for glass effects

Harrier-GR3: animate nozzles over mp, too.

Harrier-GR3: transmit stores and weapons over multiplayer. Repair livery over mp.
Also make the refueling probe optional (controlled in the fuel and payload dialog
and transmitted over mp).

New instrument ME-1866; some eye-candy and minor model improvements; clean-up

Ryan Navion / Super Navion 260 [0.3.7]
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- backport 0.3.7 to 2018.3 (no new fearures used)