Missing wall sprites superissue

[LemonInTheDark]

We are missing a few wall sprites. This is an incomplete list
Timegreen's "zeldalike" icebox ridge walls, used to show unclimbable cliffs.
The "reinforced rock" walls (red rock walls with metal struts that need to be welded off. See tgstation#59834

There's some things in game that aren't walls, but need to be made 3/4ths and should prob smooth. Grilles, blobs, aliens, etc.
Here's what we have missing of those

All the different alien sprites

We need to work out blob handling, right now they're just single sprites but that prob won't work for us, I am a tad unsure.
Of note, we should handle variations by making overlays. We can't do that for everything since they have different densities of webbing, but we really don't need one for each state in the photo here handled by #235

If you have any questions about how the input files work for this please just ask, I intend to write something up about it I just haven't yet.

info about animated sprites

[ArcaneMusic]

I saw a few of these recently, just needs to get PR'd?

[LemonInTheDark]

#163 covered some, still missing some lads though. Also need to get the hilbert's door right