Currently, "Use Advanced Panel Plugins" is a global setting that can be either on or off. This is kind of a pain, because admins sometimes need to create the advanced widgets. So, they have to temporarily turn that feature off, add the new widget, and then turn it back on. In the meantime, normal users are able to see the advanced widgets!

I think this would make more sense as a permission, so it could be granted to administrators but not to authenticated users.

Also, while we're at it, we should change the terminology from "Panel Plugins" to just "Widgets" like we're using in the rest of Panopoly.