McMMO Rank UP

📦 What changed in this update (v0.9.1)

This was a technical "under the hood" update — nothing changed for players, but the project was reorganized and modernized:

• 🗂️ Project structure cleanup — files were moved to the standard Maven layout, making the project cleaner and easier to maintain.
• 🔧 Updated dependencies — Spigot, McMMO and WorldGuard versions used in the code were bumped to more recent releases.
• ☕ Java 8 target set — the plugin is now explicitly compiled for Java 8, ensuring compatibility with most servers.
• 🌍 Fixed WorldGuard integration — updated the way the plugin communicates with WorldGuard to use the modern API, avoiding errors on newer servers.