bump the default maxMobSpawns default to 250, and add support for unlimited

Use -1 to represent vanilla/unlimited.
Updated PaperWorldConfig to also update the individual worlds limit if it was set
to the new default value.

Should hopefully help #235

Spigot-Server-Patches/Add-ability-to-configure-frosted_ice-properties.patch

@@ -9,8 +9,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 --- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 +++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
 @@ -0,0 +0,0 @@ public class PaperWorldConfig {
-         maxMobSpawnAttempts = getInt("max-mob-spawn-attempts", 50);
-         log( "Max Mob Spawn Attempts: " + maxMobSpawnAttempts);
+             }
+         }
      }
 +
 +    public boolean frostedIceEnabled = true;

Spigot-Server-Patches/Allow-capping-number-of-attempts-at-spawning-mobs.patch

@@ -20,8 +20,16 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    public int maxMobSpawnAttempts;
 +    private void maxMobSpawnAttempts() {
-+        maxMobSpawnAttempts = getInt("max-mob-spawn-attempts", 50);
++        maxMobSpawnAttempts = getInt("max-mob-spawn-attempts", 250);
 +        log( "Max Mob Spawn Attempts: " + maxMobSpawnAttempts);
++        if (maxMobSpawnAttempts < 0) {
++            maxMobSpawnAttempts = Integer.MAX_VALUE;
++        } else {
++            if (maxMobSpawnAttempts < 250 && PaperConfig.version < 10) {
++                set("max-mob-spawn-attempts", 250);
++                maxMobSpawnAttempts = 250;
++            }
++        }
 +    }
  }
 diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java

Spigot-Server-Patches/Paper-config-files.patch

@@ -66,8 +66,8 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +        commands = new HashMap<String, Command>();
 +
-+        version = getInt("config-version", 9);
-+        set("config-version", 9);
++        version = getInt("config-version", 10);
++        set("config-version", 10);
 +        readConfig(PaperConfig.class, null);
 +    }
 +
@@ -217,6 +217,9 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +
 +    private void set(String path, Object val) {
 +        config.set("world-settings.default." + path, val);
++        if (config.get("world-settings." + worldName + "." + path) != null) {
++            config.set("world-settings." + worldName + "." + path, val);
++        }
 +    }
 +
 +    private boolean getBoolean(String path, boolean def) {