Separate IMutateApproachCircles to requiring and hiding

osu.Game.Rulesets.Osu/Mods/IHidesApproachCircles.cs

@@ -4,9 +4,9 @@
 namespace osu.Game.Rulesets.Osu.Mods
 {
     /// <summary>
-    /// Any mod which affects the animation or visibility of approach circles. Should be used for incompatibility purposes.
+    /// Any mod which completely hides the approach circles. Used for incompatibility with <see cref="IRequiresApproachCircles"/>.
     /// </summary>
-    public interface IMutateApproachCircles
+    public interface IHidesApproachCircles
     {
     }
 }

osu.Game.Rulesets.Osu/Mods/IRequiresApproachCircles.cs

@@ -0,0 +1,12 @@
+// 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.
+
+namespace osu.Game.Rulesets.Osu.Mods
+{
+    /// <summary>
+    /// Any mod which requires the approach circles to be visible. Used for incompatibility with <see cref="IHidesApproachCircles"/>.
+    /// </summary>
+    public interface IRequiresApproachCircles
+    {
+    }
+}