Fix NPE in CraftBanner due to null world, potentially other things fixed

Banners only load color if the world is set. I don't know why...

For some reason, the world was not set on these, so it was changing behavior.

So if we want an accurate clone, world needs to be set.

Spigot-Server-Patches/0338-Pass-World-to-Tile-Entity-Snapshots.patch

@@ -0,0 +1,22 @@
+From 15350e98eed7c1e36d8dd8da292355542963032b Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Wed, 15 Aug 2018 01:19:04 -0400
+Subject: [PATCH] Pass World to Tile Entity Snapshots
+
+
+diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java
+index d4d9c5fc50..a72bbdbedb 100644
+--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java
++++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockEntityState.java
+@@ -50,7 +50,7 @@ public class CraftBlockEntityState<T extends TileEntity> extends CraftBlockState
+         if (DISABLE_SNAPSHOT) {
+             this.snapshot = this.tileEntity;
+         } else {
+-            this.snapshot = this.createSnapshot(this.tileEntity, null);
++            this.snapshot = this.createSnapshot(this.tileEntity, tileEntity.getWorld());
+         }
+         // copy tile entity data:
+         if(this.snapshot != null) {
+-- 
+2.18.0
+