MIT License Update to Match the rest of Gridfinity

[lavachemist]

The description says this is licensed under the same license as Zach Freedman's license, but this plugin is under a CC license. Zach moved Gridfinity to an MIT license last year.

Would you consider switching to MIT to match the source license?

Zach's announcement on Twitter/X:
https://x.com/zackfreedman/status/1650629770156326912

I also verified that all of the Thangs files do currently have an MIT license.