(svn r3167) - NewGRF: Start moving custom station code to separate files.

Rewrite handling of station classes.
          Allow for more than 8 station tile layouts.
          Start of code to unload custom stations.

waypoint.h

@@ -16,6 +16,7 @@ struct Waypoint {
 	ViewportSign sign;
 	uint16 build_date;
 	byte stat_id;
+	uint32 grfid;
 	byte deleted;          // this is a delete counter. when it reaches 0, the waypoint struct is deleted.
 };