ref: c76c4f2aac9ad0c67e2f0c19b78616eceddff735
dir: /src/gfxdata/icon/LICENSE.txt/
Someone made this icon for me for free, and I don't really know what license it has... This icon is only used for the macOS/Windows release binary, so you can simply remove it if it causes issue with licensing. Other than that, I'm fairly sure the creator would be permissive about its use, so as long as it's not used under commercial circumstances, it should be fine.