Allow sorting of skins by popularity

[Ghosty]

Currently, to find a skin in the catalog, you have to search by the uploaded ID number; newer skins are always on top on the first page, older skins are always in back, several pages in.

I suggest a button similar to the Games page that will allow you to see the most-used skins in front.

Also, to avoid abuse of this, the skin creator should not count towards the 'taken' total.