Stand-alone Junk/Exclusion list window

[filliph]

Since opening a vendor can potentially be a destructive operation (see #2), it's necessary to configure the Junk and Exclusion lists outside of vendor windows.

Ideally this would be done via a simple slash command /vendorer or /kav without any other arguments (since they can be hard to remember, I never remember it's /dejunk options).

[TheKrowi]

I think this should be quite easy to achieve even without a standalone window as you can open the vendor window with this command in game already: /run MerchantFrame:Show() (looks a little bugged but that can be handled if I'd go this route). Wrapping behind an easy to remember command is off course better. A button in the inventory also looks like an option to me.