Initial implementation of road waypoints

src/waypoint_base.h

@@ -17,6 +17,7 @@
  */
 enum WaypointFlags {
 	WPF_HIDE_LABEL              = 0, ///< Hide waypoint label
+	WPF_ROAD                    = 1, ///< This is a road waypoint
 };
 
 /** Representation of a waypoint. */
@@ -24,6 +25,8 @@ struct Waypoint FINAL : SpecializedStation<Waypoint, true> {
 	uint16 town_cn;        ///< The N-1th waypoint for this town (consecutive number)
 	uint16 waypoint_flags; ///< Waypoint flags, see WaypointFlags
 
+	TileArea road_waypoint_area; ///< Tile area the road waypoint part covers
+
 	/**
 	 * Create a waypoint at the given tile.
 	 * @param tile The location of the waypoint.