Lag compensation for wide attacks (#15877)

Content.Shared/Weapons/Melee/Events/HeavyAttackEvent.cs

@@ -11,8 +11,14 @@ public sealed class HeavyAttackEvent : AttackEvent
 {
     public readonly EntityUid Weapon;
 
-    public HeavyAttackEvent(EntityUid weapon, EntityCoordinates coordinates) : base(coordinates)
+    /// <summary>
+    /// As what the client swung at will not match server we'll have them tell us what they hit so we can verify.
+    /// </summary>
+    public List<EntityUid> Entities;
+
+    public HeavyAttackEvent(EntityUid weapon, List<EntityUid> entities, EntityCoordinates coordinates) : base(coordinates)
     {
         Weapon = weapon;
+        Entities = entities;
     }
 }