synchronise to one NavigationDirection

Core/include/ACTS/Extrapolator/Navigator.hpp

.../include/ACTS/Propagator/detail/PropagatorDefinitions.hpp

Core/include/Acts/Detector/TrackingGeometry.hpp

Core/include/Acts/Detector/TrackingVolume.hpp

Core/include/Acts/Layers/GenericApproachDescriptor.hpp

Core/include/Acts/Layers/Layer.hpp

Core/include/Acts/Layers/detail/Layer.ipp

Core/include/Acts/Material/SurfaceMaterial.hpp

Core/include/Acts/Propagator/EigenStepper.hpp

Core/include/Acts/Propagator/Propagator.hpp

Core/include/Acts/Utilities/Definitions.hpp

Core/include/Acts/Volumes/BoundarySurfaceT.hpp

Core/src/Detector/TrackingGeometry.cpp

Legacy/include/Acts/Extrapolation/ExtrapolationCell.hpp

Legacy/include/Acts/Extrapolation/ExtrapolationEngine.hpp

Legacy/include/Acts/Extrapolation/IMaterialEffectsEngine.hpp

Legacy/include/Acts/Extrapolation/INavigationEngine.hpp

Legacy/include/Acts/Extrapolation/IPropagationEngine.hpp

Legacy/include/Acts/Extrapolation/MaterialEffectsEngine.hpp

Legacy/include/Acts/Extrapolation/RungeKuttaEngine.hpp