Add basic legacy combo counter and updating positioning logic

osu.Game/Graphics/UserInterface/DefaultComboCounter.cs

@@ -1,40 +0,0 @@
-// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
-// See the LICENCE file in the repository root for full licence text.
-
-using System;
-using osu.Framework.Allocation;
-using osu.Framework.Graphics;
-using osu.Game.Graphics.Sprites;
-using osu.Game.Screens.Play.HUD;
-
-namespace osu.Game.Graphics.UserInterface
-{
-    /// <summary>
-    /// Used as an accuracy counter. Represented visually as a percentage.
-    /// </summary>
-    public class SimpleComboCounter : RollingCounter<int>, IComboCounter
-    {
-        protected override double RollingDuration => 750;
-
-        public SimpleComboCounter()
-        {
-            Current.Value = DisplayedCount = 0;
-        }
-
-        [BackgroundDependencyLoader]
-        private void load(OsuColour colours) => Colour = colours.BlueLighter;
-
-        protected override string FormatCount(int count)
-        {
-            return $@"{count}x";
-        }
-
-        protected override double GetProportionalDuration(int currentValue, int newValue)
-        {
-            return Math.Abs(currentValue - newValue) * RollingDuration * 100.0f;
-        }
-
-        protected override OsuSpriteText CreateSpriteText()
-            => base.CreateSpriteText().With(s => s.Font = s.Font.With(size: 20f));
-    }
-}