Allow players to flick utility lights on and off

[chaosvolt]

Summary

SUMMARY: Content "Add off state for utility lights, allow turning them on and off"

Purpose of change

A simple change making use of the transform feature introduced in #716, allowing players to turn utility lights off. Useful since it makes it less annoying trying to get some shuteye in places like the refugee center.

Describe the solution

Added a terrain entry for an off version of the utility light. Does not use copy-from for reasons mentioned below.

Describe alternatives you've considered

Could give the "concrete floor with overhead light" this feature too. It's not as useful since those tend to only show up in labs where players likely won't make a permanent base in anyway unless they're doing the lab challenge, plus presumably the switch would be either on the wall (not doable) or a hassle to reach. Could still do it if anyone requests however.

Testing

1. Checked affected file for syntax and load errors.
2. Ported file change over to test build and spawned in refugee center.
3. Played with the lights, confirmed transformation goes as planned, that the inactive light has a sprite via looks_like, and that it actually lets you render a lit room dark.

Additional context

Side note, turns out that terrain doesn't properly inherit symbol and color when using copy-from. It also seems that flags don't inherit properly either (TRANSPARENT at minimum visibly did not inherit right), so I quickly discarded my initial idea of using copy-from for it.

[Coolthulhu]

Ter/furn loading is copy-from-unfriendly. That could use fixing someday. Also constructions.

[chaosvolt]

Recipes are also fucky when it comes to copy-from if I recall, which is a potential problem because the repo does use copy-from for a handful of recipes but avoids using the properties that don't carry over. Mainly an issue since it can and has led to contributors copying from recipes and not recently which properties don't carry over (this happened with uncrafts for badges a while back for example, if I recall).