Re-organize all projects (#4166)

Content.Server/Singularity/EntitySystems/ContainmentFieldGeneratorSystem.cs

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+using Content.Server.Singularity.Components;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Singularity.EntitySystems
+{
+    public sealed class ContainmentFieldGeneratorSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            SubscribeLocalEvent<ContainmentFieldGeneratorComponent, PhysicsBodyTypeChangedEvent>(BodyTypeChanged);
+        }
+
+        public override void Shutdown()
+        {
+            base.Shutdown();
+
+            UnsubscribeLocalEvent<ContainmentFieldGeneratorComponent, PhysicsBodyTypeChangedEvent>();
+        }
+
+        private static void BodyTypeChanged(
+            EntityUid uid,
+            ContainmentFieldGeneratorComponent component,
+            PhysicsBodyTypeChangedEvent args)
+        {
+            component.OnAnchoredChanged();
+        }
+    }
+}

Content.Server/Singularity/EntitySystems/SingularitySystem.cs

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+using Content.Server.Singularity.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Singularity.EntitySystems
+{
+    [UsedImplicitly]
+    public class SingularitySystem : EntitySystem
+    {
+        private float _updateInterval = 1.0f;
+        private float _accumulator;
+
+        public override void Update(float frameTime)
+        {
+            base.Update(frameTime);
+            _accumulator += frameTime;
+
+            while (_accumulator > _updateInterval)
+            {
+                _accumulator -= _updateInterval;
+
+                foreach (var singularity in ComponentManager.EntityQuery<ServerSingularityComponent>())
+                {
+                    singularity.Update(1);
+                }
+            }
+
+        }
+    }
+}