Potential addition of the relict furnace graphics to housing as decoration

[brightrim]

It was suggested to add the old furnace graphics to housing as a decoration one could make use of to role-play a private workshop, even with the lack of engine functionality.

These graphics consist of one furnace graphic facing either south or west, with lit and unlit versions.

The relevant IDs: 2834-2837

The comment suggesting this: https://discord.com/channels/401855954272124940/1209503117784256523/1280534043619885108

To do:

• Come to consensus with other staff members on whether this should be added. If the verdict is yes, continue with the tasks below. If not, close the issue.
• Add the furnaces to the Lights.lua script with coal as fuel, as a way to light them, to avoid permalit light sources when possible.
• Add the unlit furnaces to the housing catalogue with relevant resources and level requirement under pottery, as the graphic mostly consists of bricks. Should be estate exclusive.