Rebase the MessageHandler, MessageHandlerChain and MessageHandlerChainSet

Rebased several other pieces of code

data/plugins/skill/prayer/bury.rb

@@ -51,11 +51,11 @@ class BuryBoneAction < Action
 end
 
 # Intercepts the first item option message.
-on :message, :first_item_option do |ctx, player, message|
+on :message, :first_item_option do |player, message|
   bone = BONES[message.id]
   unless bone == nil
     player.start_action(BuryBoneAction.new(player, message.slot, bone))
-    ctx.break_handler_chain
+    message.terminate
   end
 end
 

data/plugins/skill/prayer/prayers.rb

@@ -9,7 +9,7 @@ declare_attribute(:active_prayer, -1, :persistent)
 PRAYERS = {}
 
 # Intercept the ButtonMessage to toggle a prayer.
-on :message, :button do |ctx, player, message|
+on :message, :button do |player, message|
     button = message.widget_id
 	prayer = PRAYERS[button]