EntitySystemMessage Removal & InteractionSystem directed events (#3572)

* Removed obsolete EntitySystemMessage, now everything uses the base EntityEventArgs or the derived HandledEntityEventArgs.
Setup InteractionSystem to use new directed events.

* Update Submodule.

Content.Shared/Interfaces/GameObjects/Components/Interaction/IInteractHand.cs

@@ -29,13 +29,8 @@ namespace Content.Shared.Interfaces.GameObjects.Components
     ///      Raised when being clicked on or "attacked" by a user with an empty hand.
     /// </summary>
     [PublicAPI]
-    public class AttackHandMessage : EntitySystemMessage
+    public class AttackHandMessage : HandledEntityEventArgs
     {
-        /// <summary>
-        ///     If this message has already been "handled" by a previous system.
-        /// </summary>
-        public bool Handled { get; set; }
-
         /// <summary>
         ///     Entity that triggered the attack.
         /// </summary>