Optimize sending packets to nearby locations (sounds/effects)

Instead of using the entire world or player list, use the distance
maps to only iterate players who are even seeing the chunk the packet
is originating from.

This will drastically cut down on packet sending cost for worlds with
lots of players in them.

Closes #3437

Spigot-Server-Patches/MC-Utils.patch

@@ -3004,6 +3004,20 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
      public void b(PacketDataSerializer packetdataserializer) {
          this.a();
          packetdataserializer.writeByte(this.i);
+diff --git a/src/main/java/net/minecraft/server/DimensionManager.java b/src/main/java/net/minecraft/server/DimensionManager.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/DimensionManager.java
++++ b/src/main/java/net/minecraft/server/DimensionManager.java
+@@ -0,0 +0,0 @@ public class DimensionManager implements MinecraftSerializable {
+         return this.folder.isEmpty() ? file : new File(file, this.folder);
+     }
+ 
++    public WorldServer world; // Paper - store ref to world this manager is for
+     public WorldProvider getWorldProvider(World world) {
++        if (this.world == null) this.world = (WorldServer) world; // Paper
+         return (WorldProvider) this.providerFactory.apply(world, this);
+     }
+ 
 diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
 index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
 --- a/src/main/java/net/minecraft/server/Entity.java