Move FlightGear to latest stable release 2018.3.5 (apparently, 2019.1.1 was a development release, now unsupported).
Chagelog for 2018.3.x branch is available here.
In this package release assets were moved to flightgear-data package to ease future maintenance and rebuilds.

Depends on D8891, D8892.

Set up a flight simulation and performed a flight.