Add UI to hide Required Plugins

[aubreypwd]

Right now you have to programmatically do that. Maybe the client is annoyed with seeing WDS Required Plugins in a list they really can't do anything about. They just want to know what plugins they are working with that they use, not the one's we built for them.

A UI option to hide them would be nice. A simple toggle somewhere on the plugins screen.

[tw2113]

Many moons later. I don't think we should outright hide installed plugins, but perhaps we could make a filter like we have "active" and "inactive" for a "WDS Must use". we can hide them potentially in the "all" viewing, but show them still in the "WDS Must use" filtered version.