Core 2.7.2 beta

• Switch to Java 21.
• Improved API to change prefix of lang messages on the fly.
• Added new NightItem wrapper class to create 'cosmetic' items with support of new 1.21 item components.
• Added PlaceholderAPI config option for GUIs.
• Sound fixes.
• Fixed SQL select query for selectFirst method.
• Fixed obtain values from Bukkit registries due to bad string transform.