feature: "move to queue" command

[229c9cf0]

I currently have a 2-queue setup, the default queue uses the simple scheduler to ensure very new things or stuff like inboxes keep getting presented regularly, while older notes move to an extended queue using A-factor scheduling. This means that moving stuff from one queue to another is a pretty common occurrence.

Currently, that involves adding to the other queue, then dismissing from the current one. (Or, if there's lots of stuff, manually grabbing the table rows to move them from one file to the other.)

It would be convenient to have a direct "move to queue" command that combines adding and removing/dismissing. (Even cooler would be to have the target queue specified in the present queue's metadata YAML, so I don't have to deal with any dialog box.)