Use ThreadedLocalRandom for RNG utils

Changelog.txt

@@ -1,3 +1,5 @@
+Version 2.1.112
+    Use ThreadedLocalRandom for RNG utils, random is seeded, thus creating new instances of Random breaks randomness
 Version 2.1.112
     Correct locale usage for enum access, now enforces using the english locale to prevent issues with oddball locales for configs/commands
     Fixed a NPE that can occur if a player engages in combat with specific skills before their profile is loaded

src/main/java/com/gmail/nossr50/util/random/RandomChanceUtil.java

@@ -13,6 +13,7 @@ import org.bukkit.entity.Player;
 
 import java.text.DecimalFormat;
 import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
 
 public class RandomChanceUtil
 {
@@ -78,9 +79,7 @@ public class RandomChanceUtil
     }
 
     public static boolean rollDice(double chanceOfSuccess, int bound) {
-        Random random = new Random();
-
-        return chanceOfSuccess > random.nextInt(bound);
+        return chanceOfSuccess > ThreadLocalRandom.current().nextInt(bound);
     }
 
     /**
@@ -100,8 +99,6 @@ public class RandomChanceUtil
     {
         double chanceOfSuccess = calculateChanceOfSuccess(randomChance);
 
-        Random random = new Random();
-
         //Check the odds
         return rollDice(chanceOfSuccess, 100);
     }