DONE Icon for 3D models in misc section

[VinnyVideo]

I have no idea where the original icons came from. It's conceivable that Retriever II would know, but it's been so long that the original source may be lost to the sands of time. Either way, we'll probably spruce up various icons when the mainsite software gets updated (even if it's a small update rather than an overhaul).

I uploaded a temporary icon for now!

Course clear! You got a card.