(svn r12037) -Codechange: replace OnNewDay_(Aircraft|RoadVeh|Ship|Train) with an OnNewDay method in the Vehicle class

src/vehicle_base.h

@@ -425,6 +425,11 @@ public:
 	 */
 	virtual void Tick() {};
 
+	/**
+	 * Calls the new day handler of the vehicle
+	 */
+	virtual void OnNewDay() {};
+
 	/**
 	 * Gets the running cost of a vehicle  that can be sent into SetDParam for string processing.
 	 * @return the vehicle's running cost