Current Chunk for Entity and Block Entities, counts by entity type

This enables us a fast reference to the entities current chunk instead
of having to look it up by hashmap lookups.

We also store counts by type to further enable other performance optimizations in later patches.

Spigot-Server-Patches/0215-Add-UnknownCommandEvent.patch

@@ -0,0 +1,36 @@
+From 8b6a5b555082c1dd6de30aac296317869d9dcec9 Mon Sep 17 00:00:00 2001
+From: Sweepyoface <github@sweepy.pw>
+Date: Sat, 17 Jun 2017 18:48:21 -0400
+Subject: [PATCH] Add UnknownCommandEvent
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+index 539f492e0..77c16fe2c 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+@@ -78,6 +78,7 @@ import org.bukkit.craftbukkit.util.Versioning;
+ import org.bukkit.craftbukkit.util.permissions.CraftDefaultPermissions;
+ import org.bukkit.entity.Entity;
+ import org.bukkit.entity.Player;
++import org.bukkit.event.command.UnknownCommandEvent; // Paper
+ import org.bukkit.event.inventory.InventoryType;
+ import org.bukkit.event.player.PlayerChatTabCompleteEvent;
+ import org.bukkit.event.server.BroadcastMessageEvent;
+@@ -675,7 +676,13 @@ public final class CraftServer implements Server {
+ 
+         // Spigot start
+         if (StringUtils.isNotEmpty(org.spigotmc.SpigotConfig.unknownCommandMessage)) {
+-            sender.sendMessage(org.spigotmc.SpigotConfig.unknownCommandMessage);
++            // Paper start
++            UnknownCommandEvent event = new UnknownCommandEvent(sender, commandLine, org.spigotmc.SpigotConfig.unknownCommandMessage);
++            Bukkit.getServer().getPluginManager().callEvent(event);
++            if (StringUtils.isNotEmpty(event.getMessage())) {
++                sender.sendMessage(event.getMessage());
++            }
++            // Paper end
+         }
+         // Spigot end
+ 
+-- 
+2.18.0
+