Revert "Physics (#3452)"

This reverts commit 3e64fd56a1.

Content.Shared/Physics/SlipController.cs

@@ -0,0 +1,44 @@
+#nullable enable
+using Robust.Shared.IoC;
+using Robust.Shared.Maths;
+using Robust.Shared.Physics;
+
+namespace Content.Shared.Physics
+{
+    public class SlipController : VirtualController
+    {
+        [Dependency] private readonly IPhysicsManager _physicsManager = default!;
+
+        public SlipController()
+        {
+            IoCManager.InjectDependencies(this);
+        }
+
+        private float Decay { get; set; } = 0.95f;
+
+        public override void UpdateAfterProcessing()
+        {
+            if (ControlledComponent == null)
+            {
+                return;
+            }
+
+            if (_physicsManager.IsWeightless(ControlledComponent.Owner.Transform.Coordinates))
+            {
+                if (ControlledComponent.IsColliding(Vector2.Zero, false))
+                {
+                    Stop();
+                }
+
+                return;
+            }
+
+            LinearVelocity *= Decay;
+
+            if (LinearVelocity.Length < 0.001)
+            {
+                Stop();
+            }
+        }
+    }
+}