home display case item group

[LilShiningMan]

Summary

SUMMARY: Infrastructure "added new item group for spawning in domestic display cases"

Purpose of change

There's not a single group (including art) that really covers the breadth of what might be found on display in a person's home. I tried to make a list that wasn't unwieldy and still managed to draw from many disparate lists.

Describe the solution

went through various lists and took a few entries from each that I thought would a) fit in a piece of furniture and b) offer some variety.

Describe alternatives you've considered

just using art in my house spawn lists, but that's a bit limited.

Testing

linted and debug spawned item list in game

Additional context

This PR just contains the list and does not introduce these spawns into the game. I am currently working on a house for submission that will call this list if it's merged.

As there are many different categories called in this list, it's probably best to only spawn a single item when called.

I also thought of possibly adding this list to the standard house palette, but I'm unsure if this is the best solution. When designing a house, I personally want a bit of control over what spawns in certain furniture and I haven't successfully found a way of overriding item spawns for palette furniture entries.

[I-am-Erk]

This does need to appear somewhere. In the nested maps I added to house basements there is a basement with display cases that would fit it well.

[ZhilkinSerg]

Will need a follow-up to use that group in some mapgen (or other item groups).

We also probably need some test/script to check whether item groups are actually used by anything.

[LilShiningMan]

It looks like someone beat me to this already by adding it to the display case spawn, but I've just submitted a PR to add this list to the standard house palette for the glass cabinet furniture spawn.