refactor : removed all instances of new Random() and replaced with RandomUtil for a ThreadLocal randomizer

Mage/src/main/java/mage/util/RandomUtil.java

@@ -0,0 +1,28 @@
+package mage.util;
+
+import java.util.Random;
+import java.util.concurrent.ThreadLocalRandom;
+
+/**
+ * Created by IGOUDT on 5-9-2016.
+ */
+public class RandomUtil {
+
+    private static ThreadLocalRandom random = ThreadLocalRandom.current();
+
+    public static Random getRandom(){
+        return random;
+    }
+
+    public static int nextInt(){
+        return random.nextInt();
+    }
+
+    public static int nextInt(int max){
+        return random.nextInt(max);
+    }
+
+    public static boolean nextBoolean() {
+        return random.nextBoolean();
+    }
+}