• Now only works on 1.17 and above
• added regex-based permissions system

Permissions:
Example permissions file will be created if absent.
Users in the admins list (old system) bypass all restrictions, so be careful.
How it works:
For each group the user is in, it firstly checks if the command passes any of 'allow' regexes, and if it does - any of 'deny' regexes.
If at least one group the user is in allows the command execution, the command will be executed.