Revert "Physics (#3452)"

This reverts commit 3e64fd56a1.

Content.Shared/Physics/ContainmentFieldRepellController.cs

@@ -0,0 +1,13 @@
+#nullable enable
+using Robust.Shared.Maths;
+
+namespace Content.Shared.Physics
+{
+    public class ContainmentFieldRepellController : FrictionController
+    {
+        public void Repell(Direction dir, float speed)
+        {
+            LinearVelocity = dir.ToVec() * speed;
+        }
+    }
+}