Powered light ECS (#5028)

* Brrrr ECS

* Create lit on powered system

* Light bulb ECS

* Finishing porting to ECS

* Minor touches

* Removed events

* Removed old comments

* Fixed test

* To popup system

Content.Server/Light/EntitySystems/LitOnPoweredSystem.cs

@@ -0,0 +1,34 @@
+using Content.Server.Light.Components;
+using Content.Server.Power.Components;
+using Content.Server.Power.EntitySystems;
+using Robust.Server.GameObjects;
+using Robust.Shared.GameObjects;
+
+namespace Content.Server.Light.EntitySystems
+{
+    public class LitOnPoweredSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            base.Initialize();
+            SubscribeLocalEvent<LitOnPoweredComponent, PowerChangedEvent>(OnPowerChanged);
+            SubscribeLocalEvent<LitOnPoweredComponent, PowerNetBatterySupplyEvent>(OnPowerSupply);
+        }
+
+        private void OnPowerChanged(EntityUid uid, LitOnPoweredComponent component, PowerChangedEvent args)
+        {
+            if (EntityManager.TryGetComponent<PointLightComponent>(uid, out var light))
+            {
+                light.Enabled = args.Powered;
+            }
+        }
+
+        private void OnPowerSupply(EntityUid uid, LitOnPoweredComponent component, PowerNetBatterySupplyEvent args)
+        {
+            if (EntityManager.TryGetComponent<PointLightComponent>(uid, out var light))
+            {
+                light.Enabled = args.Supply;
+            }
+        }
+    }
+}