[WIP] alium update

Removed resin doors
Resin walls/membranes resprited, smoothing implemented
Weeds resprited, they get a neat overlay when adjacent to empty floor tiles
https://i.imgur.com/o2zJGto.png

maintainers please point out what is shit before i build on it
planned additions: toggleable alien night vision
@RemieRichards it's a wip :^)