Add Item 'swing' callback for use when playing the arm swing animation. Closes #505

patches/minecraft/net/minecraft/entity/EntityLiving.java.patch

@@ -160,7 +160,25 @@
      /**
       * Remove the speified potion effect from this entity.
       */
-@@ -3077,4 +3124,42 @@
+@@ -2982,6 +3029,17 @@
+      */
+     public void swingItem()
+     {
++        ItemStack stack = this.getHeldItem();
++
++        if (stack != null && stack.getItem() != null)
++        {
++            Item item = stack.getItem();
++            if (item.onEntitySwing(this, stack))
++            {
++                return;
++            }
++        }
++
+         if (!this.isSwingInProgress || this.swingProgressInt >= this.getArmSwingAnimationEnd() / 2 || this.swingProgressInt < 0)
+         {
+             this.swingProgressInt = -1;
+@@ -3077,4 +3135,42 @@
      {
          this.canPickUpLoot = par1;
      }

patches/minecraft/net/minecraft/item/Item.java.patch

@@ -58,7 +58,7 @@
          Vec3 vec31 = vec3.addVector((double)f7 * d3, (double)f6 * d3, (double)f8 * d3);
          return par1World.rayTraceBlocks_do_do(vec3, vec31, par3, !par3);
      }
-@@ -720,4 +734,407 @@
+@@ -720,4 +734,419 @@
      {
          StatList.initStats();
      }
@@ -464,5 +464,17 @@
 +    public ModelBiped getArmorModel(EntityLiving entityLiving, ItemStack itemStack, int armorSlot)
 +    {
 +        return null;
++    }
++
++    /**
++     * Called when a entity tries to play the 'swing' animation.
++     *  
++     * @param entityLiving The entity swinging the item.
++     * @param stack The Item stack
++     * @return True to cancel any further processing by EntityLiving 
++     */
++    public boolean onEntitySwing(EntityLiving entityLiving, ItemStack stack)
++    {
++        return false;
 +    }
  }