Elytra Aeronautics

- Players won't load or generate chunks now if they fly above a certain speed or altitude.
     - These thresholds can be configured, and even used independently from the other.
     - This feature can be compleately disabled if desired.
- Made improvements to the configuration command, it now properly suggests arguments when using it on dedicated servers.
- Greately improved the help texts for each setting of the configuration command, they are now brief, tell their possible options and their default value.
- Made improvements to how flight configuration updates for all players on a server after it is configured, now it updates right after the config command is executed (previously it updated when someone began to fly).