Support old UUID format for NBT

We have stored UUID in plenty of places that did not get DFU'd

So just look for old format and load it if it exists.

Spigot-Server-Patches/0527-Support-old-UUID-format-for-NBT.patch

@@ -0,0 +1,25 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <aikar@aikar.co>
+Date: Mon, 29 Jun 2020 03:26:17 -0400
+Subject: [PATCH] Support old UUID format for NBT
+
+We have stored UUID in plenty of places that did not get DFU'd
+
+So just look for old format and load it if it exists.
+
+diff --git a/src/main/java/net/minecraft/server/NBTTagCompound.java b/src/main/java/net/minecraft/server/NBTTagCompound.java
+index f608b35502890650adfc1df35e0794471f57ecbc..93b25e4580646ccfe8c671511e2250dbe7474a89 100644
+--- a/src/main/java/net/minecraft/server/NBTTagCompound.java
++++ b/src/main/java/net/minecraft/server/NBTTagCompound.java
+@@ -142,6 +142,11 @@ public class NBTTagCompound implements NBTBase {
+     @Nullable public UUID getUUID(String prefix) { return a(prefix); } // Paper - OBFHELPER
+     @Nullable
+     public UUID a(String s) {
++        // Paper start - support old format
++        if (hasKey(s + "Least") && hasKey(s + "Most")) {
++            return new UUID(this.getLong(s + "Most"), this.getLong(s + "Least"));
++        }
++        // Paper end
+         return GameProfileSerializer.a(this.get(s));
+     }
+