FlightGear - Flight Simulator FGAddon

Add autopush functionality (improved pushback - see https://forum.flightgear.org/viewtopic.php?f=66&t=34630) + Correct pushback position for 300 and 300ER

an24b: model adjustments; PG-5k now PG4-2 and with texture; Doors and Hatches panel

an24b: SPU-7 working correctly now; R-802 No.2 volume bug thrown out; README.md and autostart adapted; more tooltips; Circuitbreaker panel description

an24b: New tooltips; Anti-Ice pitot switches changed

an24b: animate propellers over multiplayer.

JSBSim populates the properties /fdm/jsbsim/propulsion/engine[*]/propeller-rpm,
duplicated in /engines/engine[*]/thruster/rpm. Either property may be used to
animate the propellers and various instruments. However neither of these properties
is transmitted over multiplayer by default. Instead, the mp protocol specifies
/engines/engine[*]/rpm. The solution is simply to:

- declare /engines/engine[*]/rpm as an alias for /engines/engine[*]/thruster/rpm
- use /engines/engine[*]/rpm for the propeller spin animation.

(it would be nice in the future to have propeller disks when rpm is high).

an24b: add /sim/model/fallback-model-index and max take-off weight to the fuel & payload dialog.
(with prior approval from maerchenprinz).

an24b: Tiller steering off by default; AChS: minute needle of timer added; R-836 model changes; minor model adjustments; Effect added

DG-101G: Add preview images

Lockheed1049h: Previews, fallback model, tutorial

Various minor updates to the Lockheed Super Constellation

- Add preview graphics, fallback model
- Add landing tutorial at Lelystad (host of FSWeekend)
- Add On Approach state.

Metadata tags for DO-228