Initial release of SpearProgression!

✔ Added Spear Evolution System ✔ Added PvP-based kill progression ✔ Added auto-upgrading spears (Wood → Stone → Iron → Diamond → Netherite) ✔ Added custom enchants and attack modifiers ✔ Added soulbound mechanic (spears are kept on death) ✔ Added /start command to begin the event ✔ Added data saving to config for player persistence