Don't tick empty worlds (#9025)

patches/server/Paper-config-files.patch

@@ -1843,6 +1843,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    public class UnsupportedSettings extends ConfigurationPart {
 +        public boolean fixInvulnerableEndCrystalExploit = true;
++        public boolean disableWorldTickingWhenEmpty = false;
 +    }
 +
 +    public Hopper hopper;

patches/server/disable-forced-empty-world-ticks.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Tue, 21 Mar 2023 23:51:46 +0000
+Subject: [PATCH] disable forced empty world ticks
+
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
++++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
+@@ -0,0 +0,0 @@ public class ServerLevel extends Level implements WorldGenLevel {
+ 
+         this.handlingTick = false;
+         gameprofilerfiller.pop();
+-        boolean flag1 = true || !this.players.isEmpty() || !this.getForcedChunks().isEmpty(); // CraftBukkit - this prevents entity cleanup, other issues on servers with no players
++        boolean flag1 = !paperConfig().unsupportedSettings.disableWorldTickingWhenEmpty || !this.players.isEmpty() || !this.getForcedChunks().isEmpty(); // CraftBukkit - this prevents entity cleanup, other issues on servers with no players // Paper - restore this
+ 
+         if (flag1) {
+             this.resetEmptyTime();