Rename IScrollChangeVisualiser -> IScrollAlgorithm

osu.Game/Configuration/ScrollAlgorithm.cs

@@ -0,0 +1,17 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.ComponentModel;
+
+namespace osu.Game.Configuration
+{
+    public enum ScrollAlgorithm
+    {
+        [Description("Sequential")]
+        Sequential,
+        [Description("Overlapping")]
+        Overlapping,
+        [Description("Constant")]
+        Constant
+    }
+}