Rolling counters (initial)

osu.Game/Graphics/UserInterface/ScoreCounter.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace osu.Game.Graphics.UserInterface
+{
+    public class ScoreCounter : ULongCounter
+    {
+        /// <summary>
+        /// How many leading zeroes the counter will have.
+        /// </summary>
+        public uint LeadingZeroes = 0;
+
+        protected override string formatCount(ulong count)
+        {
+            return count.ToString("D" + LeadingZeroes);
+        }
+    }
+}