Add a heat displacement map

[PowerfulBacon]

It would be nice to visualise heat, in the same way that the SM and gravity orbs manipulate the game plane, it could probably use an animated displacement map on the game-plane somehow.

[MarkusLarsson421]

It would be neat, so you don't casually enter Medbay only to be vaporized as if a nuclear bomb just detonated in front of you.

[github-actions]

This issue has been inactive for long enough to be automatically marked as stale. If this was a bug report and hasn't been addressed yet, and is still a problem, please don't hesitate to notify a maintainer.