Remove skill id constants from bootstrap, improve consumables code.

data/plugins/consumables/consumable.rb

@@ -7,12 +7,12 @@ CONSUME_ANIMATION_ID = 829
 
 # An item that can be consumed to produce a skill effect.
 class Consumable    
-  attr_reader :name, :id
+  attr_reader :name, :id, :sound
 
-  def initialize(name, id, sound_id)
+  def initialize(name, id, sound)
     @name = name.to_s.gsub(/_/, ' ')
     @id = id
-    @sound_id = sound_id
+    @sound = sound
   end
 
   def consume(player)
@@ -39,7 +39,7 @@ class ConsumeAction < Action
   def execute()
     if @executions == 0
       mob.inventory.reset(@slot)
-      consumable.consume(mob)
+      @consumable.consume(mob)
       mob.play_animation(Animation.new(CONSUME_ANIMATION_ID))
       @executions += 1
     else
@@ -56,7 +56,8 @@ end
 # Intercepts the first item option message and consumes the consumable, if necessary.
 on :message, :first_item_option do |ctx, player, message|
   consumable = CONSUMABLES[message.id]
-  unless consumable == nil
+
+  unless consumable.nil?
     player.start_action(ConsumeAction.new(player, message.slot, consumable))
     ctx.break_handler_chain
   end