Remove useless things

osu.Game.Rulesets.Mania/Objects/ManiaHitObject.cs

@@ -8,7 +8,7 @@
 
 namespace osu.Game.Rulesets.Mania.Objects
 {
-    public abstract class ManiaHitObject : HitObject, IHasColumn, IHasLayer, IHasXPosition, IHasEditableColumn, IHasEditableLayer
+    public abstract class ManiaHitObject : HitObject, IHasColumn, IHasXPosition, IHasEditableColumn
     {
         public event Action<int> ColumnChanged;
 

osu.Game.Rulesets.Mania/UI/DrawableManiaJudgement.cs

@@ -8,7 +8,7 @@
 
 namespace osu.Game.Rulesets.Mania.UI
 {
-    internal class DrawableManiaJudgement : DrawableJudgement
+    public class DrawableManiaJudgement : DrawableJudgement
     {
         public DrawableManiaJudgement(Judgement judgement, DrawableHitObject judgedObject)
             : base(judgement, judgedObject)

osu.Game.Rulesets.Mania/UI/ManiaStage.cs

@@ -25,7 +25,7 @@ namespace osu.Game.Rulesets.Mania.UI
     /// <summary>
     /// A collection of <see cref="Column"/>s.
     /// </summary>
-    internal class ManiaStage : ScrollingPlayfield
+    public class ManiaStage : ScrollingPlayfield
     {
         public const float HIT_TARGET_POSITION = 50;
 
@@ -34,6 +34,8 @@ internal class ManiaStage : ScrollingPlayfield
         /// </summary>
         public readonly Bindable<bool> Inverted = new Bindable<bool>(true);
 
+        public bool DisplayJudgements = true;
+
         public IReadOnlyList<Column> Columns => columnFlow.Children;
         private readonly FillFlowContainer<Column> columnFlow;
 

osu.Game/Rulesets/Edit/Types/IHasEditableLayer.cs

@@ -1,12 +0,0 @@
-// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
-// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
-
-using osu.Game.Rulesets.Objects.Types;
-
-namespace osu.Game.Rulesets.Edit.Types
-{
-    public interface IHasEditableLayer : IHasLayer
-    {
-        void OffsetLayer(int offset);
-    }
-}