Re-organize all projects (#4166)

Content.Server/Nutrition/EntitySystems/HungerSystem.cs

@@ -0,0 +1,26 @@
+using Content.Server.Nutrition.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Nutrition.EntitySystems
+{
+    [UsedImplicitly]
+    public class HungerSystem : EntitySystem
+    {
+        private float _accumulatedFrameTime;
+
+        public override void Update(float frameTime)
+        {
+            _accumulatedFrameTime += frameTime;
+
+            if (_accumulatedFrameTime > 1)
+            {
+                foreach (var comp in ComponentManager.EntityQuery<HungerComponent>(true))
+                {
+                    comp.OnUpdate(_accumulatedFrameTime);
+                }
+                _accumulatedFrameTime -= 1;
+            }
+        }
+    }
+}