Adds per-world spawn limits (#4837)

Spigot-Server-Patches/0758-add-per-world-spawn-limits.patch

@@ -0,0 +1,49 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: chase <chasewhip20@gmail.com>
+Date: Wed, 2 Dec 2020 22:43:39 -0800
+Subject: [PATCH] add per world spawn limits
+
+Taken from #2982. Credit to Chasewhip8
+
+diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+index 5c91c007691efeea1d4383efcd1ca06990d0660c..fcacc08db8f5a58ddd06be7f9f2cb2cf6b2231c3 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
++++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+@@ -653,6 +653,19 @@ public class PaperWorldConfig {
+         zombieVillagerInfectionChance = getDouble("zombie-villager-infection-chance", zombieVillagerInfectionChance);
+     }
+ 
++    public int spawnLimitMonsters = -1;
++    public int spawnLimitAnimals = -1;
++    public int spawnLimitWaterAnimals = -1;
++    public int spawnLimitWaterAmbient = -1;
++    public int spawnLimitAmbient = -1;
++    private void perWorldSpawnLimits() {
++        spawnLimitMonsters = getInt("spawn-limits.monsters", spawnLimitMonsters);
++        spawnLimitAnimals = getInt("spawn-limits.animals", spawnLimitAnimals);
++        spawnLimitWaterAnimals = getInt("spawn-limits.water-animals", spawnLimitWaterAnimals);
++        spawnLimitWaterAmbient = getInt("spawn-limits.water-ambient", spawnLimitWaterAmbient);
++        spawnLimitAmbient = getInt("spawn-limits.ambient", spawnLimitAmbient);
++    }
++
+     public int lightQueueSize = 20;
+     private void lightQueueSize() {
+         lightQueueSize = getInt("light-queue-size", lightQueueSize);
+diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+index 02198dbe9e80c2990e8a09b2b763748dae727a03..c0b49a0eaeda06b89a4fb425eec3d5bfa9717379 100644
+--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
++++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+@@ -353,6 +353,13 @@ public class CraftWorld implements World {
+         this.generator = gen;
+ 
+         environment = env;
++        // Paper start - per world spawn limits
++        this.monsterSpawn = this.world.paperConfig.spawnLimitMonsters;
++        this.animalSpawn = this.world.paperConfig.spawnLimitAnimals;
++        this.waterAnimalSpawn = this.world.paperConfig.spawnLimitWaterAnimals;
++        this.waterAmbientSpawn = this.world.paperConfig.spawnLimitWaterAmbient;
++        this.ambientSpawn = this.world.paperConfig.spawnLimitAmbient;
++        // Paper end
+     }
+ 
+     @Override