New command to list, filter and perform actions on a patch

[maninak]

The treeview we have showing the patches is good for some tasks, especially at a glance, but it isn't the easiest way to interact with patches and some tasks like filtering by id (or any other datum) aren't at all possible. Finding a patch by eye and clicking on their small button targets isn't optimal. Furthermore commands on the palette are always accessible globally regardless of current focus.

We should have a new command, e.g. "Search/list all patches" that can fuzzy filter at least according to title, description, id, (maybe also status, delegate and label), perhaps via a multi-step single-select form.
Upon selection of a single patch the user should be presented with possible actions to perform on that patch, e.g. show details view, reveal on treeview, copy id/title/description, check out patch branch (maybe also select revision too?), etc.