FlightGear - Flight Simulator FGAddon

Update to match refactored C++ implementation.

PA28: Adjust /instrumentation/gps/over-flight-distance-nm according to forum discussion https://forum.flightgear.org/viewtopic.php?f=25&t=38292#p376456

A320: Merge trunk to release/2020.3

A320: Remove files that were meant to be deleted (rename or replacement). Through user error, they were committed again to fgaddon rather than be deleted.

A320 updates:
APU: fix spurious shutdown on power transient
Update autopush
Fix refuel panel for lbs / kgs
Switch ECAM controller to Emesary
Enable Compositor shadow mapping
Bugfix for departure transitions
Improvements to announcements and cabin alert by MiSKLaCH
Improved stall alert (only in alternate or direct law)
Add TCAS ECAM warnings

North American T28 'Trojan': Compatibility with Compositor. Bumpmap added. Revision of the FDM

North American T28 'Trojan': Compatibility with Compositor. Bumpmap added. Revision of the FDM

Robinson R44 (Raven II and Clipper): FDM revision, Compositor compatibility, file reorganization.

an24b: Mostly cleanup; new KPPM model; minor additions to Fire Ext System

mosquito/mosquito-common.xml: updated version to 3.3.5.