Port OSRM, Engine and Datafacades to be algorithm aware

include/osrm/osrm.hpp

@@ -131,7 +131,7 @@ class OSRM final
     Status Tile(const TileParameters &parameters, std::string &result) const;
 
   private:
-    std::unique_ptr<engine::Engine> engine_;
+    std::unique_ptr<engine::EngineInterface> engine_;
 };
 }
 

include/osrm/osrm_fwd.hpp

@@ -54,7 +54,7 @@ struct MatchParameters;
 struct TileParameters;
 } // ns api
 
-class Engine;
+class EngineInterface;
 struct EngineConfig;
 } // ns engine
 } // ns osrm