This version will allow each registered LevelUp handler to respond to their placeholder identifier. Supported placeholders: %levelup_item_level% %levelup_player_level% %levelup_pickaxe_level% %levelup_pickaxe_level_percentage% %levelup_pickaxe_level_meter% %levelup_pickaxe_xp% %levelup_pickaxe_xp_percentage% %levelup_pickaxe_xp_meter% %levelup_pickaxe_xp_to_next% %levelup_sword_level% %levelup_sword_level_percentage% %levelup_sword_level_meter% %levelup_sword_xp% %levelup_sword_xp_percentage% %levelup_sword_xp_meter% %levelup_sword_xp_to_next% %levelup_bow_level% %levelup_bow_level_percentage% %levelup_bow_level_meter% %levelup_bow_xp% %levelup_bow_xp_percentage% %levelup_bow_xp_meter% %levelup_bow_xp_to_next%