* Before this commit, only the true altitude was known for an aircraft situation. The pressure altitude was not available anywhere yet.
* This caused a wrong altitude in radar clients.
* We fix this reading the pressure altitude from the simulators and set it in the own aircraft situation.
* MS Flight Simulators have the pressure altitude in the APIs available.
* For X-Plane and emulated simulator, we need to calculate it from the pressure at sea level.
* Finally, we use the new available pressure altitude to send it to the FSD server.
Maniphest Tasks: Ref T223
* located in context since context owns matcher object
* call from GUI
* some code formatting to indicate the cross simulator slots connected in runtime
refs #780
* function for default model and situation in context (so they can be reused as in login component)
* use CDatabaseUtils::consolidateOwnAircraftModelWithDbData for lookup
* changed signature of ownAircraftModelChanged to model
* added function for a reverse lookup of a model (string->model) and use it when model changed
* renamed function to updateByLocalFileNames
