Revert "Re-add Chunk Priority/Urgency System (#5829)"

This reverts commit 24b7da65ee.

Patch was updated incorrectly and needs a closer look.

patches/server/0679-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 ea136b9ad3a2a07076e12b8656c68f63aa4718c8..cf0a74b8a1c31d4bc493eb09a69ee2bd94cb6485 100644
+--- a/src/main/java/net/minecraft/server/Main.java
++++ b/src/main/java/net/minecraft/server/Main.java
+@@ -239,6 +239,7 @@ 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();
+                 }