Add UsingClosestAnchor to ISkinnableDrawable

Also implement it as an auto property in its inheritors.
The auto properties default to true.

osu.Game/Screens/Play/HUD/DefaultAccuracyCounter.cs

@@ -12,6 +12,8 @@ namespace osu.Game.Screens.Play.HUD
         [Resolved(canBeNull: true)]
         private HUDOverlay hud { get; set; }
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         [BackgroundDependencyLoader]
         private void load(OsuColour colours)
         {

osu.Game/Screens/Play/HUD/DefaultComboCounter.cs

@@ -17,6 +17,8 @@ namespace osu.Game.Screens.Play.HUD
         [Resolved(canBeNull: true)]
         private HUDOverlay hud { get; set; }
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         public DefaultComboCounter()
         {
             Current.Value = DisplayedCount = 0;

osu.Game/Screens/Play/HUD/DefaultHealthDisplay.cs

@@ -72,6 +72,8 @@ namespace osu.Game.Screens.Play.HUD
             }
         }
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         public DefaultHealthDisplay()
         {
             Size = new Vector2(1, 5);

osu.Game/Screens/Play/HUD/DefaultScoreCounter.cs

@@ -20,6 +20,8 @@ namespace osu.Game.Screens.Play.HUD
         [Resolved(canBeNull: true)]
         private HUDOverlay hud { get; set; }
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         [BackgroundDependencyLoader]
         private void load(OsuColour colours)
         {

osu.Game/Screens/Play/HUD/HitErrorMeters/HitErrorMeter.cs

@@ -22,6 +22,8 @@ namespace osu.Game.Screens.Play.HUD.HitErrorMeters
         [Resolved]
         private OsuColour colours { get; set; }
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         [BackgroundDependencyLoader(true)]
         private void load(DrawableRuleset drawableRuleset)
         {

osu.Game/Screens/Play/HUD/LegacyComboCounter.cs

@@ -59,6 +59,8 @@ namespace osu.Game.Screens.Play.HUD
             set => counterContainer.Alpha = value ? 1 : 0;
         }
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         public LegacyComboCounter()
         {
             AutoSizeAxes = Axes.Both;

osu.Game/Screens/Play/HUD/SkinnableInfo.cs

@@ -32,11 +32,7 @@ namespace osu.Game.Screens.Play.HUD
 
         public Anchor Origin { get; set; }
 
-        /// <summary>
-        /// <p><see langword="true"/> if this <see cref="ISkinnableDrawable"/>'s <see cref="Drawable.Anchor"/> is
-        /// automatically determined by proximity, <see langword="false"/> if the user has overridden it.</p>
-        /// <p>Corresponds to <see cref="osu.Game.Extensions.DrawableExtensions.UsingClosestAnchor"/> at runtime.</p>
-        /// </summary>
+        /// <inheritdoc cref="ISkinnableDrawable.UsingClosestAnchor"/>
         public bool UsingClosestAnchor { get; set; } = true;
 
         public List<SkinnableInfo> Children { get; } = new List<SkinnableInfo>();

osu.Game/Screens/Play/SongProgress.cs

@@ -78,6 +78,8 @@ namespace osu.Game.Screens.Play
 
         private IClock referenceClock;
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         public SongProgress()
         {
             RelativeSizeAxes = Axes.X;

osu.Game/Skinning/ISkinnableDrawable.cs

@@ -14,5 +14,11 @@ namespace osu.Game.Skinning
         /// Whether this component should be editable by an end user.
         /// </summary>
         bool IsEditable => true;
+
+        /// <summary>
+        /// <see langword="true"/> if this <see cref="ISkinnableDrawable"/>'s <see cref="Drawable.Anchor"/> is automatically determined by proximity,
+        /// <see langword="false"/> if the user has overridden it.
+        /// </summary>
+        bool UsingClosestAnchor { get; set; }
     }
 }

osu.Game/Skinning/LegacyAccuracyCounter.cs

@@ -12,6 +12,8 @@ namespace osu.Game.Skinning
 {
     public class LegacyAccuracyCounter : GameplayAccuracyCounter, ISkinnableDrawable
     {
+        public bool UsingClosestAnchor { get; set; } = true;
+
         public LegacyAccuracyCounter()
         {
             Anchor = Anchor.TopRight;

osu.Game/Skinning/LegacyHealthDisplay.cs

@@ -30,6 +30,8 @@ namespace osu.Game.Skinning
 
         private bool isNewStyle;
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         [BackgroundDependencyLoader]
         private void load()
         {

osu.Game/Skinning/LegacyScoreCounter.cs

@@ -13,6 +13,8 @@ namespace osu.Game.Skinning
         protected override double RollingDuration => 1000;
         protected override Easing RollingEasing => Easing.Out;
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         public LegacyScoreCounter()
             : base(6)
         {

osu.Game/Skinning/SkinnableTargetComponentsContainer.cs

@@ -17,6 +17,8 @@ namespace osu.Game.Skinning
     {
         public bool IsEditable => false;
 
+        public bool UsingClosestAnchor { get; set; } = true;
+
         private readonly Action<Container> applyDefaults;
 
         /// <summary>