Add Reload Config command

[jwidess]

This PR simply adds an /auth reload command to the mod, which allows you to reload the config.json file while running. This makes config changes far easier to test without needing to reboot the server.

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AI Overview Below:

This pull request introduces a new /auth reload command to allow reloading the mod configuration at runtime, updates the mod version, and improves initialization. The most significant changes are grouped below:

Feature Addition: Runtime Configuration Reload

• Added a /auth reload command (permission level 2 required) that reloads the configuration and provides a success message to the user.
• Added a new localized message reload_success for feedback after reloading the configuration.

Initialization & Configuration Handling

• Changed static initialization in OfflineAuthHandler to explicitly load the configuration (config.load()) during class loading, ensuring configuration is available before other static initializations.
• Removed unnecessary call to AuthConfig.save() in the mod's main class constructor, streamlining startup.

Version Update

• Updated the mod version in gradle.properties from 1.0.1 to 1.0.4.