Add a plugin store

[oddbyte]

There was a plugin called Plugin Browser for bunny, but that wasn't a built-in behavior. I'd like to see a built in plugin store in the client.

[oSumAtrIX]

I'm unsure how much we can realize this because it conflicts with decentralization. At least the default source needs to be environment configurable in source.

[true1ann]

it conflicts with decentralization.

You can just have list of repos to gather infos from, with the last in the list being the most preffered source, no?

[oSumAtrIX]

No, because then we still have a central opinionated list, regardless of ordering that conflicts with decentralization.