Alien floor/walls rename

[zulixe]

About The Pull Request

renamed alien walls + floor to polymer alloy which I somehow missed with my last PR

Why It's Good For The Game

Pre-Merge Checklist

• [ ] You tested this on a local server.
• [ ] This code did not runtime during testing.
• [x] You documented all of your changes.

Changelog

:cl: /:cl: