FlightGear - Flight Simulator FGAddon

Merge release to 2020.3

A320 August Update:
- Added cockpit and passenger oxygen system
- Added new electrical system (rewritten inverter / bus switching logic / battery logic / emer gen logic)
- ND: Add "TA ONLY" and "GPS PRIMARY"
- Add FCU dimming knob
- Improve navdisplay: fix flickering bug; add trigonometrically calculated wind display
- PFD: add tailstrike indicator
- PFD: add metric altitude display
- Hydraulics: init with accumulator pressure
- ECAM: Improve LAND ASAP memos, fix right ECAM memos
- SD: allow display on E/WD if you press and hold the SD button with an electrical failure
- Sim: improve flightgear version checks

Cessna 140: Add stub interior objects, make prop and window glass not cast shadows

Arsenal VG 33: Best NormalMap. Relative paths. Procedural lights.

Arsenal VG 33: Best NormalMap. Relative paths. Procedural lights.

Cessna 140: Add McCauley prop, use this one for now as it is more common. Add propeller model and propdisc

Cessna 140: Small FDM adjustment, add limits, add references

Merge trunk to release/2020.3

A320-family July update:
Smooth the brake pressure guage
Implement BFO mode on the ADF backup instrument
Improve Nasal code quality
Add Global Speed Protection mode for overspeed in CLB or DES modes.
Improve MCDU webpanel
Add autoland light
Corrections for FMGC reset, Simbrief corrections
Improve the FCU and PFD display of FPA / VS
ND: add TCAS 2.5nm ring
Improve the system display - rewrite with Emesary
Improve light manager nasal code
Bugfix the ECAM phase switching (phase 1 / phase 10)

New model: Tupolev I-4 / Ant 5