* use static const arg1s (not always create temp. arg strings)
* use QStringBuilder to concatenate several parts at once
* done during Ref T275, but not really related
* flags for same parts/situation status
* transfer elevation (Ref T273) from previous situation
* preset elevation based on network situations if possible
* set elevation info
* function CInterpolator::initInterpolatedSituation
Rational: Except for FS9 we interpolate all aircraft in one loop at the same time. This can cause that some steps are always done at the same time for all aircraft of that loop. By passing the number we can more equally distribute such tasks, avoiding peaks.
Rational: the idea was to keep track of ground elevations of all aircraft and hence using them for other aircraft on ground. But the "hit" ratio is bad, so we only keep a small number of elevations ("the last ones") and use those. The size of the cache is dynamically adjusted. Not moving aircraft are still found in that much smaller list.
* interpolatedParts already "logs", do not do it twice
* performance: only recalculate "this->remoteAircraftSituationsAndChange(setup)" when there are new situations, not every interpolation step
The variant convertFromMemoizedJson trait did already do something similar, calling "convertFromJson" if the memoized version is not avilable. Now the function also "decides" based on the passed data itself.
* removed "IndexEnableGndFlag" as this is actually part of FSD network settings
* renamed to "isForcingVtolInterpolation"
* adjusted interpolator, and UI for setup
* min/max ground distance, also added in situation list
* use model's vtol/CG info
* improved scenery deviation guessing
* adjusted interpolator scenery deviation handling
* return interpolation results parts/situation in one step
* base class init for each interpolation step, less redundant code
* removed old interpolation/parts function
* adjusted unit tests and simulator objects (such as SimObject)
* using interface IInterpolant, renamed to CInterpolant for concrete implmentation
* CInterpolatorPBH has itws own file now, is included
* linear interpolator only re-calculates interpolant when needed (same as spline interpolator)
* use CAircraftSituationChange
* recalculate interpolant if situation changed (due to elevation update)
* keep extra info string for debugging
* improved situation checking
