Prepare for restart / crash detection rewrite.

By: md_5 <md_5@live.com.au>

CraftBukkit-Patches/0028-Improved-tile-entity-lookup-for-chunk-sending.patch

@@ -0,0 +1,30 @@
+From d5d64c9cc4c90075cca6aa720e5cab3109a4e5f1 Mon Sep 17 00:00:00 2001
+From: shakytom <tom.roberts00@gmail.com>
+Date: Wed, 20 Feb 2013 22:34:38 -0500
+Subject: [PATCH] Improved tile entity lookup for chunk sending
+
+Instead of scanning the entire worlds tile entities to find out what tile entities are in the chunk... just use the arraylist of tile entities we already have.
+This results in a good reduction of time spent in player ticking.
+---
+ src/main/java/net/minecraft/server/EntityPlayer.java | 5 +++--
+ 1 file changed, 3 insertions(+), 2 deletions(-)
+
+diff --git a/src/main/java/net/minecraft/server/EntityPlayer.java b/src/main/java/net/minecraft/server/EntityPlayer.java
+index 8d61ca6..28f462b 100644
+--- a/src/main/java/net/minecraft/server/EntityPlayer.java
++++ b/src/main/java/net/minecraft/server/EntityPlayer.java
+@@ -163,8 +163,9 @@ public class EntityPlayer extends EntityHuman implements ICrafting {
+ 
+                 iterator1.remove();
+                 if (chunkcoordintpair != null && this.world.isLoaded(chunkcoordintpair.x << 4, 0, chunkcoordintpair.z << 4)) {
+-                    arraylist.add(this.world.getChunkAt(chunkcoordintpair.x, chunkcoordintpair.z));
+-                    arraylist1.addAll(((WorldServer) this.world).getTileEntities(chunkcoordintpair.x * 16, 0, chunkcoordintpair.z * 16, chunkcoordintpair.x * 16 + 16, 256, chunkcoordintpair.z * 16 + 16));
++                    Chunk chunk = this.world.getChunkAt(chunkcoordintpair.x, chunkcoordintpair.z); // Spigot
++                    arraylist.add(chunk); // Spigot
++                    arraylist1.addAll(chunk.tileEntities.values()); // Spigot
+                 }
+             }
+ 
+-- 
+1.8.1-rc2
+