1.15.2 update (#2887)

Functional GUI fix added by billygalbreath

Spigot-Server-Patches/Optimize-Captured-TileEntity-Lookup.patch

@@ -10,7 +10,7 @@ Optimize to check if the captured list even has values in it, and also to
 just do a get call since the value can never be null.
 
 diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
-index e07e63e55..3e57546a3 100644
+index a5b451877..13ff6a11f 100644
 --- a/src/main/java/net/minecraft/server/World.java
 +++ b/src/main/java/net/minecraft/server/World.java
 @@ -0,0 +0,0 @@ public abstract class World implements GeneratorAccess, AutoCloseable {