Testing was done on Minecraft 1.21.4

Changelog:

- Improved smooth movement significantly
- Changed initial movement setting to 'smooth' instead of 'original' in the 'config.yml'. If the server is older than Minecraft 1.21, it will always use the original movement.
- Changed some texts format
- Removed some code for older versions which could cause the server to lag upon join.
- Fixed an issue when the server crashes and players are then stuck in spectator.
- Fixed opped players being included in all permission groups.
- Added option to set a chunk radius to be loaded before a player teleports to a view. Default value is '5', can be changed in 'config.yml'.
- Added NULL checks for certain events.