TODO: finish the sprites for th double stacker take a look at industry and ship and do a maintenance update to them write down sources and licenses Misc Useful links: https://github.com/JGRennison/nml https://newgrf-specs.tt-wiki.net/wiki/NML https://www.tt-forums.net/viewtopic.php?t=65598 https://pythonhosted.org/nml/nml-language.html https://github.com/OpenTTD/nml4-usage