Guidance and delegates

FGraffityARLocalizationGuidance: bAvailable, AngularErrorRadians, YawRadians, PitchRadians, bHasTarget, TargetInTrackingSpace and HoverRemainingSeconds. Delegates: OnStateChanged(State), OnError(Error), OnLocalized(State), OnLocalizationFinished(bSuccess), OnNavigationChanged(State). Section/alignment state is published before successful completion. Commands from inside delegates must be deferred.