v1.2.0

This pull request introduces several improvements and updates across the project, including workflow enhancements, licensing updates, dependency refactoring, and feature improvements. The key changes are grouped below:

Workflow Enhancements:

• Added GPR_USER and GPR_API_KEY environment variables to the jobs section of .github/workflows/alpha.yml, .github/workflows/beta.yml, and .github/workflows/main.yml to support GitHub Package Registry authentication.

Licensing Updates:

• Replaced the "All rights reserved" license in README.md with an MIT License and added a new LICENSE file containing the MIT License text.

Dependency Refactoring:

• Updated imports in LyttleAdmin.java to use Console and Message classes from the lyttleutils package. Refactored their instantiation to use instance variables instead of static methods.
• Updated StaffCommand.java and LyttleAdminCommand.java to replace static Message and Console calls with instance-based calls through the plugin object.

Feature Improvements:

• Updated gradle.properties to increment the plugin version from 1.1.3 to 1.2.0.
• Added a plugin field to PlayerJoinListener to improve code consistency and maintainability.