1.15.2 update (#2887)

Functional GUI fix added by billygalbreath

Spigot-API-Patches/getPlayerUniqueId-API.patch

@@ -9,7 +9,7 @@ In Offline Mode, will return an Offline UUID
 This is a more performant way to obtain a UUID for a name than loading an OfflinePlayer
 
 diff --git a/src/main/java/org/bukkit/Bukkit.java b/src/main/java/org/bukkit/Bukkit.java
-index 161a714e5..0c519c412 100644
+index 161a714e..0c519c41 100644
 --- a/src/main/java/org/bukkit/Bukkit.java
 +++ b/src/main/java/org/bukkit/Bukkit.java
 @@ -0,0 +0,0 @@ public final class Bukkit {
@@ -34,7 +34,7 @@ index 161a714e5..0c519c412 100644
       * Gets the plugin manager for interfacing with plugins.
       *
 diff --git a/src/main/java/org/bukkit/Server.java b/src/main/java/org/bukkit/Server.java
-index 463724e40..8a76df524 100644
+index 463724e4..8a76df52 100644
 --- a/src/main/java/org/bukkit/Server.java
 +++ b/src/main/java/org/bukkit/Server.java
 @@ -0,0 +0,0 @@ public interface Server extends PluginMessageRecipient {