Add configuration classes for reactor settings and world generation

[Giovanniricotta2002]

This pull request introduces a new configuration system for the Create Nuclear mod, adding several configuration classes and ensuring they are registered properly. The changes include the addition of new configuration files, modifications to the main initialization method, and the setup of configuration registration.

Configuration System Enhancements:

• Added CNConfigs class to manage and register configuration files, including event handling for loading and reloading configurations.
• Created CNCCommon class to define common configuration settings, including nested configurations for world generation, rods, and explosions.
• Introduced CExplose class to manage explosion-related settings, including size, type, and duration of reactor explosions.
• Added CRods class to configure rod-related settings, such as uranium and graphite rod lifespans and maximum reactor heat.
• Implemented CWorldGen class to control world generation settings, with an option to disable world generation.

Main Initialization Changes:

• Updated CreateNuclear.java to import CNConfigs and register configurations during the mod initialization process. [1] [2]