Multiple world commands

[csdt]

Many commands can deal with multiple worlds at the same time:

* start [world]
* stop [world]
* force-stop [world]
* restart [world]
* force-restart [world]
* status [world]
* logrotate [world]
* backup [world]
* map [world]
* update [world]

But we can only either execute such a command for one single world, or all of them. I think it would be great to be able to specify multiple worlds for those commands

[sandain]

This would be fairly easy to implement if someone is looking for a project. I would, but I don't really have the time right now.

[sandain]

@Roflicide sent in PR #205 to add this feature, so closing this issue. Thanks @Roflicide!