Merge branch 'custom_bridgeheads' into jgrpp

# Conflicts:
#	docs/landscape_grid.html
#	src/roadveh_cmd.cpp
#	src/saveload/afterload.cpp
#	src/saveload/extended_ver_sl.cpp
#	src/saveload/extended_ver_sl.h
#	src/settings_gui.cpp
#	src/settings_type.h
#	src/tunnelbridge_cmd.cpp
#	src/tunnelbridge_map.h

src/tunnelbridge_map.h

@@ -260,4 +260,7 @@ static inline void SetTunnelBridgePBS(TileIndex t, bool is_pbs)
 	SB(_me[t].m6, 6, 1, is_pbs ? 1 : 0);
 }
 
+void AddRoadTunnelBridgeInfrastructure(TileIndex begin, TileIndex end);
+void SubtractRoadTunnelBridgeInfrastructure(TileIndex begin, TileIndex end);
+
 #endif /* TUNNELBRIDGE_MAP_H */