Changes:
- Added has_groups_on_ladder, next_group_on_ladder, previous_group_on_ladder, next_group and previous_group placeholders.
- Some optimizations to the permission system.
- Added support for redis authentication with usernames.
- Added ServerManagerBridge command to send players to a servergroup using commands on the spigot server.
- Added subscribe method to EventBus with PostOrder argument.
- Added support for 1.18