FlightGear - Flight Simulator FGAddon

F-15: VSD optimisations

- Props.UpdateManager used to update the display;
- use Emesary Exec loop

also
- Update text at slowest rate
- Targets update every 4th frame

F-14: Fix external dependency error

F-14: Bugfixes

Related to settimer induced reposition slowdown

- restructure Nasal loops to use Emesary rtExec; reduce frequency of Nasal execution
- change settimer loops to be maketimer() loops

Other:
- fix gear always down on reposition
- change adverse.nas into JSBSim system
- fix spoilers still working for roll control when using manual sweep
- fix manual sweep and CADC sweep

F-16: added fallback model support

Antonov-An-12: bug fix: no.3 propeller over multiplayer

an24b: falback-model-index: switch from the ATR-42 to the Fokker 50 for the fallback model.
This is more accurate, especially with respect to the placement of the main landing gear.
The ATR-42 has the gear under the fuselage; the Fokker 50 has it under the engine nacelles
like the An-24.

CRJ700-family: add fallback-model-index.

For the 700, fall back on the Fokker 70; for the 900 and 1000, fall back on the Fokker 100.

737-100: add fallback-model-index.

eurofighter: add fallback-model-index.

bf109: add fallback-model-index.