Start to structure flow of information in Player.

- Allow basic clicking of hitobjects.
- Break non-osu! game modes temporarily.
- Fix some issues with RollingCounters.
- Add the ability to increment counters.

osu.Game/Graphics/UserInterface/ScoreCounter.cs

@@ -49,6 +49,11 @@ namespace osu.Game.Graphics.UserInterface
             return count.ToString("D" + LeadingZeroes);
         }
 
+        public override void Increment(ulong amount)
+        {
+            Count = Count + amount;
+        }
+
         protected class TransformScore : Transform<ulong>
         {
             public override ulong CurrentValue