Revert "Physics (#3452)"

This reverts commit 3e64fd56a1.

Content.Shared/Physics/ConveyedController.cs

@@ -0,0 +1,62 @@
+#nullable enable
+using Content.Shared.GameObjects.Components.Movement;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Maths;
+using Robust.Shared.Physics;
+
+namespace Content.Shared.Physics
+{
+    public class ConveyedController : VirtualController
+    {
+        public override IPhysicsComponent? ControlledComponent { protected get; set; }
+
+        public void Move(Vector2 velocityDirection, float speed, Vector2 itemRelativeToConveyor)
+        {
+            if (ControlledComponent?.Owner.IsWeightless() ?? false)
+            {
+                return;
+            }
+
+            if (ControlledComponent?.Status == BodyStatus.InAir)
+            {
+                return;
+            }
+
+            LinearVelocity = velocityDirection * speed;
+
+            //gravitating item towards center
+            //http://csharphelper.com/blog/2016/09/find-the-shortest-distance-between-a-point-and-a-line-segment-in-c/
+            Vector2 centerPoint;
+
+            var t = 0f;
+            if (velocityDirection.Length > 0) //if velocitydirection is 0, this calculation will divide by 0
+            {
+                t = Vector2.Dot(itemRelativeToConveyor, velocityDirection) /
+                    Vector2.Dot(velocityDirection, velocityDirection);
+            }
+
+            if (t < 0)
+            {
+                centerPoint = new Vector2();
+            }
+            else if(t > 1)
+            {
+                centerPoint = velocityDirection;
+            }
+            else
+            {
+                centerPoint = velocityDirection * t;
+            }
+
+            var delta = centerPoint - itemRelativeToConveyor;
+            LinearVelocity += delta * (4 * delta.Length);
+        }
+
+        public override void UpdateAfterProcessing()
+        {
+            base.UpdateAfterProcessing();
+
+            LinearVelocity = Vector2.Zero;
+        }
+    }
+}