Marry AckData to LLQueItem, and store packet data and length there for

use everywhere. Each packet gets serialized only once now in PacketHandler

OpenSim/Region/ClientStack/LindenUDP/LLQueItem.cs

@@ -42,5 +42,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         public ThrottleOutPacketType throttleType;
         public int TickCount;
         public Object Identifier;
+        public int Resends;
+        public Byte[] Bytes;
+        public int Length;
     }
 }