Big Red Changes Part 1: Admin (#4838)

# About the pull request

This (hopefully) string of PRs aims to re-detail areas of big red that
visually don't have a lot going on, such as breaking up copy-pasted
bedrooms, adding dirt and grime floor decals, and placing props / adding
new ways into underused areas

This PR focuses entirely on colony admin and the nightmare inserts in it
I've added to that funny little middle room that no one goes into to
hopefully make it more seen and used and widened some hallways, of
course, some minor retailing and honestly not much else

# Explain why it's good for the game

Honestly feel like Big Red is one of the maps in most need of a glow up,
it can get pretty barebones in places and has a lot of underused rooms
I'm not aiming to rework the entire map just small additions piece by
piece because the last time I did this I did it all at once and my map
file corrupted trying to fix merge conflicts

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl: SpartanBobby
maptweak: Alot of changes to big reds admin area, including new windows,
prop placement, room detailing, new doors
/:cl: