Makes thieving gloves sneakier (#21398)

* Hidden DoAfters

* Fix formatting warnings

* Hide progress bar and pickup animation

* Copy Hidden field in copy constructor

Content.Shared/DoAfter/DoAfterArgs.cs

@@ -40,6 +40,12 @@ public sealed partial class DoAfterArgs
 
     public NetEntity? NetUsed;
 
+    /// <summary>
+    /// Whether the progress bar for this DoAfter should be hidden from other players.
+    /// </summary>
+    [DataField]
+    public bool Hidden;
+
     #region Event options
     /// <summary>
     ///     The event that will get raised when the DoAfter has finished. If null, this will simply raise a <see cref="SimpleDoAfterEvent"/>
@@ -239,6 +245,7 @@ public sealed partial class DoAfterArgs
         Delay = other.Delay;
         Target = other.Target;
         Used = other.Used;
+        Hidden = other.Hidden;
         EventTarget = other.EventTarget;
         Broadcast = other.Broadcast;
         NeedHand = other.NeedHand;