Bukkit

GUI menu overhaul

• Added navigation bars and click/open sounds to all GUI menus
• Added /k info and /k prefix GUI menus
• Added player head icon skin rendering

Multi-world kingdom support

• Added config option for world blacklist/whitelist
• Valid worlds can contain kingdom capitals and towns, with per-territory world saved to config data files

Bug fixes

• Fixed Citizens NPCs from causing Null Pointer Exceptions as invalid player objects
• Fixed /k map command causing TPS lag
• Optimized town load times on server startup

Miscellaneous

• Config files (config.yml, upgrades.yml) retain previous valid settings when plugin version updates
• Added English language file messages