Working on interpolation

src/Location.h

@@ -210,6 +210,7 @@ namespace FRG
 		bool setNavigationAreaAvailable(const std::string& areaName, bool available);
 
 		void update(int64_t deltaMs, const LocationSimulationEvents& events);
+		void updatePresentation(int64_t deltaMs);
 		// Purely visual feedback for click-triggered player routes. Disabling it
 		// also cancels an animation that is currently playing.
 		void setPathVisualizationEnabled(bool enabled);