* using split by callsign everywhere
* helper function to insert_front
* revised linear interpolator
* renamed to remoteAircraft
* renamed to container() in providers (gettters are usually copies)
Issues why changes did so long:
* insert in list is not adding in front, but same as push_back (that was confusing)
* naming of values before/after in interpolator was ambigious
* QMap keeps values sorted by key, not arbitrarily
* keep split per callsign map in IInterpolator (so it is available for all interpolators)
* Interpolator using CWorker, so it can run in background
* added signals to provider to add split situations / callsigns
* adjustments to airspace / context for those signals
* thread safe access to those from interpolator
* renamed from rendered to remote aircraft as discussed
* adjust samples
* removed no longer required functions in timestampobjectlist
* changed connectioStatusChanged from uint -> int
* consolidated ICoordinateGeodetic (e.g. fixed nested properties)
* shifted common functionality for objects/containers with callsign into interface
* shifted common functionality for objects/containers with geo position into interface
* shifted common functionality for objects/containers with timestamp into interface
* updated corresponding value objects / specialized lists
* adjusted all places where renamed functions are used
