Some work on the mess that is this power code.

Jesus.

Tons of fixes, refactors and other things.
The powernet's code is still awful though.

Content.Server/GameObjects/Components/Power/PoweredLightComponent.cs

@@ -0,0 +1,33 @@
+using SS14.Server.GameObjects;
+using SS14.Shared.Enums;
+using SS14.Shared.GameObjects;
+
+namespace Content.Server.GameObjects.Components.Power
+{
+    public class PoweredLightComponent : Component
+    {
+        public override string Name => "PoweredLight";
+
+        public override void Initialize()
+        {
+            base.Initialize();
+
+            var device = Owner.GetComponent<PowerDeviceComponent>();
+            var sprite = Owner.GetComponent<SpriteComponent>();
+            var light = Owner.GetComponent<PointLightComponent>();
+            device.OnPowerStateChanged += (sender, args) =>
+            {
+                if (args.Powered)
+                {
+                    sprite.LayerSetTexture(0, "Objects/wall_light.png");
+                    light.State = LightState.On;
+                }
+                else
+                {
+                    sprite.LayerSetTexture(0, "Objects/wall_light_off.png");
+                    light.State = LightState.Off;
+                }
+            };
+        }
+    }
+}