- Delete lists of domains if the rule about to change is of type Lists.
- Monitor the lists of domains, and reload them if they're modified.
- Delete rules from disk when the Duration changes from
Always (saved on disk) to !Always (temporary).
- After the above operation a fsnotify Remove event is fired. Don't
delete the rule from memory if it's temporary.
- Rules are only compiled if they're enabled, avoiding unnecessary
allocations.