Add back pull moving (#3635)

* Add back pull moving

* Make pull moving event-based, use map coordinates, slow down moving when getting closer and stop moving when very close, add max range and add compensation for overshooting

* Remove compensation

* Prevent pull move from pulling you

* acruid did this

* Add unsubscriptions to shutdown

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Client/GameObjects/EntitySystems/PullingSystem.cs

@@ -0,0 +1,30 @@
+using Content.Client.GameObjects.Components.Pulling;
+using Content.Shared.GameObjects.EntitySystemMessages.Pulling;
+using Content.Shared.GameObjects.EntitySystems;
+using JetBrains.Annotations;
+using Robust.Client.Physics;
+
+namespace Content.Client.GameObjects.EntitySystems
+{
+    [UsedImplicitly]
+    public class PullingSystem : SharedPullingSystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            UpdatesAfter.Add(typeof(PhysicsSystem));
+
+            SubscribeLocalEvent<PullableComponent, PullableMoveMessage>(OnPullableMove);
+            SubscribeLocalEvent<PullableComponent, PullableStopMovingMessage>(OnPullableStopMove);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+
+            UnsubscribeLocalEvent<PullableComponent, PullableMoveMessage>(OnPullableMove);
+            UnsubscribeLocalEvent<PullableComponent, PullableStopMovingMessage>(OnPullableStopMove);
+        }
+    }
+}