- Messenger no longer has a static nature and must be instantiated to be used. The prefix is provided in the constructor.
- MobArena instantiates a global Messenger in onEnable() with a prefix string from global-settings. This instance is used by anything that isn't arena-specific, as well as for arenas with no prefix.
- ArenaImpl instantiates a local Messenger in its constructor if, and only if, its arena-specific prefix setting is non-empty. Otherwise it uses the plugin's global instance.
This removes the logging capabilities from Messenger and replaces all references to them with proper logging via Bukkit's PluginLogger that all plugins have.
Andreas Troelsen