Command to show list of mods used in a selection or clipboard

### The Problem

I've made a few schem files, and I'd like to list all the mods involved inside the schem file to those I share it with. I can take a manual stock of this, but for large areas, it would be nice to have some way to get a list of just the mods in use in that area. I have looked for a way to do this, but have not found anything. Apologies if that is something that is already around.

### A Solution

A command that will look at a selection or the clipboard, take stock of all the mods that are present in that area, and print out a list.

### Alternatives

_No response_

### Anything Else?

Having a verbose option that lists all the mods, and then a sub-list of all the blocks present from each mod would also be cool.