Added Features:

1. Explosion Radius Configuration: Added the option to configure the explosion radius of fireballs via settings.explosionRadius in the config file.
2. Permission Support for Setting Explosion Radius: Players can now change the explosion radius with the /ufireball setradius <radius> command, with validation for acceptable radius values.
3. Plugin Reload Command: Added /ufireball reload command for reloading the plugin configuration.
4. Permission Management for Fireball Launching: Introduced the /ufireball setlaunchperms <true|false> command to toggle permission-based fireball launching.