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/PercentageCounter.cs

@@ -45,6 +45,11 @@ namespace osu.Game.Graphics.UserInterface
             return Math.Abs(currentValue - newValue) * RollingDuration * 100.0f;
         }
 
+        public override void Increment(float amount)
+        {
+            Count = Count + amount;
+        }
+
         protected class TransformAccuracy : TransformFloat
         {
             public override void Apply(Drawable d)

osu.Game/Graphics/UserInterface/RollingCounter.cs

@@ -86,7 +86,14 @@ namespace osu.Game.Graphics.UserInterface
             }
         }
 
-        protected float textSize = 20.0f;
+        public void Set(T value)
+        {
+            Count = value;
+        }
+
+        public abstract void Increment(T amount);
+
+        protected float textSize;
 
         public float TextSize
         {
@@ -107,6 +114,8 @@ namespace osu.Game.Graphics.UserInterface
             {
                 DisplayedCountSpriteText = new SpriteText(),
             };
+
+            TextSize = 40;
         }
 
         public override void Load(BaseGame game)

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