Update modern forwarding to v3 (#8219)

patches/server/0641-Add-environment-variable-to-disable-server-gui.patch

@@ -0,0 +1,18 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Riley Park <riley.park@meino.net>
+Date: Mon, 17 May 2021 00:34:55 -0700
+Subject: [PATCH] Add environment variable to disable server gui
+
+
+diff --git a/src/main/java/net/minecraft/server/Main.java b/src/main/java/net/minecraft/server/Main.java
+index 8bbc3a1e7f848047ff915d5bdf08d376e71c4025..ce4aed84d751a48dcd2a8409190db4a22d78f77b 100644
+--- a/src/main/java/net/minecraft/server/Main.java
++++ b/src/main/java/net/minecraft/server/Main.java
+@@ -267,6 +267,7 @@ public class Main {
+                 */
+                 boolean flag1 = !optionset.has("nogui") && !optionset.nonOptionArguments().contains("nogui");
+ 
++                if(!Boolean.parseBoolean(System.getenv().getOrDefault("PAPER_DISABLE_SERVER_GUI", String.valueOf(false)))) // Paper
+                 if (flag1 && !GraphicsEnvironment.isHeadless()) {
+                     dedicatedserver1.showGui();
+                 }