Ordered sendq (once more with feeling edition)

Implemented ordering by use of a lock-and-pulse queue.  This
mechanism does use a syncroot and thus isn't lock free, but
performs far better than the previous iterations.  The
SendData mechanism has been reverted as this method no longer
relies on the allocations of sequences.

CPU has been drastically reduced because of the reduction in
looping in the write threads, and sits between 0-2% with 35
players in live testing.

Fixes Pryaxis/TShock#1049, #27, #26, #9

Terraria/MessageBuffer.cs

@@ -1626,7 +1626,6 @@ public void GetData(int start, int length)
 				}
 				case 31:
 				{
-					LinkedList<SequenceItem> sequence = new LinkedList<SequenceItem>();
 					if (Main.netMode != 2)
 					{
 						return;
@@ -1640,18 +1639,16 @@ public void GetData(int start, int length)
 					}
 					for (int t1 = 0; t1 < 40; t1++)
 					{
-						NetMessage.SendData(sequence, 32, this.whoAmI, -1, "", num81, (float)t1, 0f, 0f, 0, 0, 0);
+						NetMessage.SendData(32, this.whoAmI, -1, "", num81, (float)t1, 0f, 0f, 0, 0, 0);
 					}
-					NetMessage.SendData(sequence, 33, this.whoAmI, -1, "", num81, 0f, 0f, 0f, 0, 0, 0);
+					NetMessage.SendData(33, this.whoAmI, -1, "", num81, 0f, 0f, 0f, 0, 0, 0);
 					Main.player[this.whoAmI].chest = num81;
 					if (Main.myPlayer == this.whoAmI)
 					{
 						Main.recBigList = false;
 					}
 					Recipe.FindRecipes();
-					NetMessage.SendData(sequence, 80, -1, this.whoAmI, "", this.whoAmI, (float)num81, 0f, 0f, 0, 0, 0);
-
-					Netplay.Clients[this.whoAmI].sendQueue.Enqueue(sequence);
+					NetMessage.SendData(80, -1, this.whoAmI, "", this.whoAmI, (float)num81, 0f, 0f, 0, 0, 0);
 
 					if (Main.tile[num79, num80].frameX < 36 || Main.tile[num79, num80].frameX >= 72)
 					{