Always process chunk removal in removeEntity

Spigot might skip chunk registration changes in removeEntity
which can keep them in the chunk when they shouldnt be if done
during entity ticking.

Should fix some cases where "Entity is still in another chunk section"
Related to #1223

Spigot-Server-Patches/0342-Always-process-chunk-removal-in-removeEntity.patch

@@ -0,0 +1,33 @@
+From 529731e4258b21416a555ed6c2d0200b8449f1d7 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Sat, 28 Jul 2018 12:09:20 -0400
+Subject: [PATCH] Always process chunk removal in removeEntity
+
+Spigot might skip chunk registration changes in removeEntity
+which can keep them in the chunk when they shouldnt be if done
+during entity ticking.
+
+diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
+index d2d2ab794..df98a4f44 100644
+--- a/src/main/java/net/minecraft/server/World.java
++++ b/src/main/java/net/minecraft/server/World.java
+@@ -1272,7 +1272,7 @@ public abstract class World implements IBlockAccess {
+             this.everyoneSleeping();
+         }
+ 
+-        if (!guardEntityList) { // Spigot - It will get removed after the tick if we are ticking
++        // if (!guardEntityList) { // Spigot - It will get removed after the tick if we are ticking // Paper - move down
+         int i = entity.ab;
+         int j = entity.ad;
+ 
+@@ -1280,6 +1280,7 @@ public abstract class World implements IBlockAccess {
+             this.getChunkAt(i, j).b(entity);
+         }
+ 
++        if (!guardEntityList) { // Spigot - It will get removed after the tick if we are ticking // Paper - always remove from current chunk above
+         // CraftBukkit start - Decrement loop variable field if we've already ticked this entity
+         int index = this.entityList.indexOf(entity);
+         if (index != -1) {
+-- 
+2.18.0
+