Partial fix for departure board with scheduled dispatch

In case that the scheduled point is a station, the departure board cannot map arrival->departure correctly when showing both in same line is enabled.

For individial departure, the departure time and vehicle are not correspondence to each other. There will be train departing at that time, but might not be the vehicle shown in the board.

src/departures_type.h

@@ -74,6 +74,7 @@ typedef struct Departure {
 	DepartureType type;                    ///< The type of the departure (departure or arrival)
 	const Vehicle *vehicle;                ///< The vehicle performing this departure
 	const Order *order;                    ///< The order corresponding to this departure
+	uint scheduled_waiting_time;           ///< Scheduled waiting time if scheduled dispatch is used
 	Departure() : terminus(INVALID_STATION), via(INVALID_STATION), calling_at(), vehicle(NULL) { }
 	~Departure()
 	{