[ICON REQUEST]: Substance 3D Designer

### I have searched through the issues and didn't find my problem.

- [X] Confirm

### About the icon

This tool is heavily used in game development for material creation jointly with Substance 3D Painter

### Links and sources

https://www.adobe.com/products/substance3d-designer.html
https://uxwing.com/adobe-substance-3d-designer-icon/
https://www.flaticon.com/free-icon/substance-3d-designer_5968470

### Additional information

This icon falls under the "special cases" icon category, as it is related to game development but not coding itself. However, as this program is used primarily using [Substance 3D Painter](https://github.com/devicons/devicon/issues/1947), it should not be included without it.