Limit spawn amount if too many entities are in the world

Can be controlled in the config with `sceneEntityLimit`

src/main/java/emu/grasscutter/command/commands/SpawnCommand.java

@@ -20,6 +20,7 @@ import javax.swing.text.html.parser.Entity;
 import java.util.List;
 import java.util.Random;
 
+import static emu.grasscutter.Configuration.*;
 import static emu.grasscutter.utils.Language.translate;
 
 @Command(label = "spawn", usage = "spawn <entityId> [amount] [level(monster only)]", permission = "server.spawn", permissionTargeted = "server.spawn.others", description = "commands.spawn.description")
@@ -62,8 +63,17 @@ public final class SpawnCommand implements CommandHandler {
             CommandHandler.sendMessage(sender, translate(sender, "commands.generic.invalid.entityId"));
             return;
         }
+       
         Scene scene = targetPlayer.getScene();
         
+        if (scene.getEntities().size() + amount > GAME_OPTIONS.sceneEntityLimit) {
+        	amount = Math.max(Math.min(GAME_OPTIONS.sceneEntityLimit - scene.getEntities().size(), amount), 0);
+        	CommandHandler.sendMessage(sender, translate(sender, "commands.spawn.limit_reached", amount));
+        	if (amount <= 0) {
+        		return;
+        	}
+        }
+
         double maxRadius = Math.sqrt(amount * 0.2 / Math.PI);
         for (int i = 0; i < amount; i++) {
             Position pos = GetRandomPositionInCircle(targetPlayer.getPos(), maxRadius).addY(3);

src/main/java/emu/grasscutter/utils/ConfigContainer.java

@@ -171,7 +171,7 @@ public class ConfigContainer {
     public static class GameOptions {
         public InventoryLimits inventoryLimits = new InventoryLimits();
         public AvatarLimits avatarLimits = new AvatarLimits();
-        public int worldEntityLimit = 1000; // Unenforced. TODO: Implement.
+        public int sceneEntityLimit = 1000; // Unenforced. TODO: Implement.
 
         public boolean watchGachaConfig = false;
         public boolean enableShopItems = true;

src/main/resources/languages/en-US.json

@@ -306,6 +306,7 @@
     "spawn": {
       "usage": "Usage: spawn <entityID> [amount] [level(monster only)]",
       "success": "Spawned %s of %s.",
+      "limit_reached": "Scene spawn limit reached. Spawning %s entities instead.",
       "description": "Spawns an entity near you"
     },
     "stop": {