Map queuing

[benrobson]

Describe the feature you'd like
With setnext, if you run it multiple times, it replaces the last map that was set. With this feature, it creates a queue that queues up maps to the played in order.

Usefulness of the feature
Would be very useful for staff that are setting next maps and especially helpful for events if Staff is running things like set next events and such, setting next the communities favourite maps.

[BennyDoesStuff]

Would this be a separate command from /setnext? If it isn't, how would that work for the situations where a staff member might've queued the wrong next map.