Duels Optimised

• Introduced a new teleportToLobby method in the Duels interface to teleport players to the lobby.
• Implemented the method in DuelsPlugin with thorough null checks.
• Introduced hasUsableTotem method to verify if a player has a totem equipped in their main or off hand.
• Updated round-ending logic to account for potential totem protection against lethal damage.
• Updated CommandsConfig to handle unset or empty alias configurations correctly.
• Added unregisterPluginCommands in DuelsPlugin to clean up stale command entries during plugin unload.
• Introduced average_rating and avg_rating placeholders in PlaceholderHook.
• Implemented averageRating method to calculate the average rating across all kits.
• Prevent cursor-held items from being included in death drops during duels
• Added checks in Teleport to handle players sleeping or inside vehicles.
• Adjusted DuelManager to use setHealth(0) for ending matches instead of manually restoring player state, avoiding corruption risks.
• Introduced duel cooldown configuration in config.yml.
• Added SelfCooldownValidator and TargetCooldownValidator to validate duel cooldowns.
• Updated User and UserData to handle cooldown timestamps and implement cooldown logic.
• Integrated cooldown checks and enforcement in DuelManager, RequestManager, and related classes.
• Updated lang.yml with new message for players in cooldown.

• Added support for configurable button types, slots, and glow effects in config.yml.
• Refactored button constructors to utilize new configuration options for button types and data.
• Introduced glowing button support with hidden enchantments.

• Improve queue matching logic by skipping unnecessary attempts when no arenas are available.
• Update KitEditListener to prevent stack splitting during kit editing.

Fixed startup errors where plugin was saying to contact author due to bad relocation of folialib.

Fixed inventory loss bug