Add obfuscation helper patch to assist update process.

By: md_5 <git@md-5.net>

CraftBukkit-Patches/0021-Faster-UUID-for-entities.patch

@@ -0,0 +1,23 @@
+From 0c0bfe8b1127e609cdaf82697bf7ba4a87af5cd3 Mon Sep 17 00:00:00 2001
+From: md_5 <md_5@live.com.au>
+Date: Sun, 17 Mar 2013 19:02:50 +1100
+Subject: [PATCH] Faster UUID for entities
+
+It is overkill to create a new SecureRandom on each entity create and then use it to make a new Entity ID for every entity instance created. Instead we will just use a pseudo random UUID based off the random instance we already have.
+
+diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
+index 4bcd57e..621f593 100644
+--- a/src/main/java/net/minecraft/server/Entity.java
++++ b/src/main/java/net/minecraft/server/Entity.java
+@@ -140,7 +140,7 @@ public abstract class Entity {
+         this.random = new Random();
+         this.maxFireTicks = 1;
+         this.justCreated = true;
+-        this.uniqueID = UUID.randomUUID();
++        this.uniqueID = new UUID(random.nextLong(), random.nextLong()); // Spigot
+         this.as = EnumEntitySize.SIZE_2;
+         this.world = world;
+         this.setPosition(0.0D, 0.0D, 0.0D);
+-- 
+1.8.3.2
+