ASK21: Passenger: fix wrong principal aircraft tag, thanks LarsT!
J3Cub: FG1000 panel mods, IT STEC55x corrections, misc cleanup
Readd accidentally removed multikey setting
Fix *-set.xml for launcher-scanning
Cessna 140: minor fixes
Bergfalke: MP fix
ASK13: Cleanup, optimise for MP
ASG29: MP optimization
AlphaElectro: optimise MP
P51D, FDM: workaround for JSBSim castor wheel issue (Daniel Dubreuil)
