Loads of backup-related changes and additions!

* Add the 'rollback' command, a command to roll back the servers world (i.e: rollback 2 days, rollback 30 minutes)
* Move stuff from Console to Activity.
* Add restartConsole()
* Add world backups, with json configs.
* Change backup json formatting (will include in readme sometime in the future)
* Fix event nullpointerexception bug.
* Modify event argument handling to support multiple arguments.
* Remove op event for now, it'll be readded later.