Merge branch 'master' into jgrpp-nrt

Merge NRT feature

# Conflicts:
#	docs/landscape.html
#	docs/landscape_grid.html
#	src/bridge_map.h
#	src/build_vehicle_gui.cpp
#	src/company_base.h
#	src/company_cmd.cpp
#	src/misc_gui.cpp
#	src/newgrf.cpp
#	src/newgrf_engine.cpp
#	src/pathfinder/follow_track.hpp
#	src/pathfinder/npf/npf.cpp
#	src/road_cmd.cpp
#	src/road_func.h
#	src/road_gui.cpp
#	src/road_map.h
#	src/road_type.h
#	src/roadveh_cmd.cpp
#	src/saveload/afterload.cpp
#	src/saveload/company_sl.cpp
#	src/script/api/script_bridge.cpp
#	src/table/newgrf_debug_data.h
#	src/tile_cmd.h
#	src/town_cmd.cpp
#	src/tunnel_map.h
#	src/tunnelbridge_cmd.cpp

src/command_type.h

@@ -242,6 +242,7 @@ enum Commands {
 	CMD_REMOVE_LONG_ROAD,             ///< remove a complete road (not a "half" one)
 	CMD_BUILD_ROAD,                   ///< build a "half" road
 	CMD_BUILD_ROAD_DEPOT,             ///< build a road depot
+	CMD_CONVERT_ROAD,                 ///< convert a road type
 
 	CMD_BUILD_AIRPORT,                ///< build an airport