Re-organize all projects (#4166)

Content.Server/APC/PowerApcSystem.cs

@@ -0,0 +1,19 @@
+#nullable enable
+using Content.Server.APC.Components;
+using JetBrains.Annotations;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.APC
+{
+    [UsedImplicitly]
+    internal sealed class PowerApcSystem : EntitySystem
+    {
+        public override void Update(float frameTime)
+        {
+            foreach (var apc in ComponentManager.EntityQuery<ApcComponent>(false))
+            {
+                apc.Update();
+            }
+        }
+    }
+}