Flashlights now run off a power cell. (#121)

* Flashlight runs off a power cell now.

* Cleanup

Content.Server/GameObjects/EntitySystems/HandHeldLightSystem.cs

@@ -0,0 +1,23 @@
+using Content.Server.GameObjects.Components.Interactable;
+using SS14.Shared.GameObjects;
+using SS14.Shared.GameObjects.Systems;
+
+namespace Content.Server.GameObjects.EntitySystems
+{
+    public class HandHeldLightSystem : EntitySystem
+    {
+        public override void Initialize()
+        {
+            EntityQuery = new TypeEntityQuery(typeof(HandheldLightComponent));
+        }
+
+        public override void Update(float frameTime)
+        {
+            foreach (var entity in RelevantEntities)
+            {
+                var comp = entity.GetComponent<HandheldLightComponent>();
+                comp.OnUpdate(frameTime);
+            }
+        }
+    }
+}