Override BlockPosition.MutableBlockPosition.isValidLocation()

Fixes GH-281

Spigot-Server-Patches/0100-Optimize-isValidLocation-for-inlining.patch

@@ -1,4 +1,4 @@
-From e678b0cd49904fd62192a607e2444dd4c8eae5d4 Mon Sep 17 00:00:00 2001
+From 3a02b0e6f4d2149f1be45e802a51ecfae1fa7453 Mon Sep 17 00:00:00 2001
 From: Aikar <aikar@aikar.co>
 Date: Tue, 22 Mar 2016 23:41:34 -0400
 Subject: [PATCH] Optimize isValidLocation for inlining
@@ -23,6 +23,23 @@ index d60e755..9114388 100644
  
      public BaseBlockPosition(int i, int j, int k) {
          this.a = i;
+diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
+index 99fcf4c..be34dcd 100644
+--- a/src/main/java/net/minecraft/server/BlockPosition.java
++++ b/src/main/java/net/minecraft/server/BlockPosition.java
+@@ -326,6 +326,12 @@ public class BlockPosition extends BaseBlockPosition {
+         protected int b;
+         protected int c;
+         protected int d;
++        // Paper start
++        @Override
++        public boolean isValidLocation() {
++            return this.getX() >= -30000000 && this.getZ() >= -30000000 && this.getX() < 30000000 && this.getZ() < 30000000 && this.getY() >= 0 && this.getY() < 256;
++        }
++        // Paper end
+ 
+         public MutableBlockPosition() {
+             this(0, 0, 0);
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
 index 3bdf072..ecf3a38 100644
 --- a/src/main/java/net/minecraft/server/World.java