Rework emergency lights (#1830)

* Implement emergency lights reacting to lost power

* Add emergency light sprites
Remove shared emergency light component

* Remove unused import

* Remove EmergencyLight NetID

* Add rich description
Change comments
Add license
Implement ExposeData

Co-authored-by: Julian Giebel <j.giebel@netrocks.info>

Content.Client/GameObjects/Components/EmergencyLightComponent.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using Robust.Client.Animations;
 using Robust.Client.GameObjects;
 using Robust.Client.GameObjects.Components.Animations;
@@ -13,6 +13,7 @@ namespace Content.Client.GameObjects.Components
     {
         public override string Name => "EmergencyLight";
 
+        /// <inheritdoc/>
         protected override void Startup()
         {
             base.Startup();