Delete entry

[friday]

It's possible to use alt_enter as a secondary action, to show a list of all actions or trigger one directly.

I'm personally not a fan of this combination (prefer Alfred's "right arrow") and don't need the delete method that badly either, so if you do, let me know or submit a PR (I'll be happy to review it).

The logic needs to go in the clipboard manager as a new method, since the actual code will differ by manager. You don't need to cover all three clipboard managers.