Rebase the MessageHandler, MessageHandlerChain and MessageHandlerChainSet

Rebased several other pieces of code

data/plugins/consumables/consumable.rb

@@ -54,11 +54,11 @@ class ConsumeAction < Action
 end
 
 # Intercepts the first item option message and consumes the consumable, if necessary.
-on :message, :first_item_option do |ctx, player, message|
+on :message, :first_item_option do |player, message|
   consumable = CONSUMABLES[message.id]
 
   unless consumable.nil?
     player.start_action(ConsumeAction.new(player, message.slot, consumable))
-    ctx.break_handler_chain
+    message.terminate
   end
 end