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/IDraggable.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using System;
 using Robust.Shared.Analyzers;
 using Robust.Shared.GameObjects;
@@ -58,7 +58,7 @@ namespace Content.Shared.Interfaces.GameObjects.Components
         }
     }
 
-    public class StartDragDropEventArgs : EventArgs
+    public class StartDragDropEventArgs : EntityEventArgs
     {
         /// <summary>
         ///     Creates a new instance of <see cref="StartDragDropEventArgs"/>.