Re-organize all projects (#4166)

Content.Shared/Stunnable/StunSystem.cs

@@ -0,0 +1,19 @@
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Shared.Stunnable
+{
+    [UsedImplicitly]
+    internal sealed class StunSystem : EntitySystem
+    {
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+
+            foreach (var component in ComponentManager.EntityQuery<SharedStunnableComponent>(true))
+            {
+                component.Update(frameTime);
+            }
+        }
+    }
+}