Improve hands & pulling (#4389)

Content.Shared/Pulling/Events/PullMessage.cs

@@ -0,0 +1,17 @@
+using Robust.Shared.GameObjects;
+using Robust.Shared.Physics;
+
+namespace Content.Shared.Physics.Pull
+{
+    public class PullMessage : EntityEventArgs
+    {
+        public readonly IPhysBody Puller;
+        public readonly IPhysBody Pulled;
+
+        protected PullMessage(IPhysBody puller, IPhysBody pulled)
+        {
+            Puller = puller;
+            Pulled = pulled;
+        }
+    }
+}