Indicate source mod of protected structures.

[JavidPack]

https://discord.com/channels/276235094622994433/562404975456681991/1389052555623137330

How to (manually?) identify if world generation of 2 mods are conflict with each other?
Can Worldgen-Previewer highlight change by each mod?
The protected structure highlight is so useful. I doubt if there would be the same for each specific mod that impact world gen.
If I have this info, I can manually identify the conflict of them. (and it looks fun too)

I bet we could determine somehow which mod is adding which rectangles by checking the Mod of the current pass. Could potentially be useful.