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/Further-improve-server-tick-loop.patch

@@ -12,7 +12,7 @@ Previous implementation did not calculate TPS correctly.
 Switch to a realistic rolling average and factor in std deviation as an extra reporting variable
 
 diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
-index 92d48025..47fe9262 100644
+index 92d480251..47fe9262a 100644
 --- a/src/main/java/net/minecraft/server/MinecraftServer.java
 +++ b/src/main/java/net/minecraft/server/MinecraftServer.java
 @@ -0,0 +0,0 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IAs
@@ -147,7 +147,7 @@ index 92d48025..47fe9262 100644
                      }
                      lastTick = curTime;
 diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
-index 33b40ffc..bfddd168 100644
+index 33b40ffc2..bfddd1685 100644
 --- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 +++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
 @@ -0,0 +0,0 @@ public final class CraftServer implements Server {
@@ -169,7 +169,7 @@ index 33b40ffc..bfddd168 100644
      {
  
 diff --git a/src/main/java/org/spigotmc/TicksPerSecondCommand.java b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
-index be2e31de..6d21c326 100644
+index be2e31dea..6d21c3269 100644
 --- a/src/main/java/org/spigotmc/TicksPerSecondCommand.java
 +++ b/src/main/java/org/spigotmc/TicksPerSecondCommand.java
 @@ -0,0 +0,0 @@