Resolves EmergencyLightVisualizer is Obsolete (#13887)

* Split EmergencyLightVisualizer into Component/System pair

* Server ignore EmergencyLightVisualizer

* Update YAML

* Reviews

* small

---------

Co-authored-by: AJCM <AJCM@tutanota.com>

Content.Client/Light/Visualizers/EmergencyLightVisualizer.cs

@@ -1,39 +0,0 @@
-using Content.Shared.Light.Component;
-using Robust.Client.GameObjects;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Serialization.Manager.Attributes;
-
-namespace Content.Client.Light.Visualizers
-{
-    [DataDefinition]
-    public sealed class EmergencyLightVisualizer : AppearanceVisualizer
-    {
-        [Obsolete("Subscribe to AppearanceChangeEvent instead.")]
-        public override void OnChangeData(AppearanceComponent component)
-        {
-            base.OnChangeData(component);
-
-            var entities = IoCManager.Resolve<IEntityManager>();
-            if (!entities.TryGetComponent(component.Owner, out SpriteComponent? sprite))
-                return;
-
-            if (!component.TryGetData(EmergencyLightVisuals.On, out bool on))
-                on = false;
-
-            sprite.LayerSetState(EmergencyLightVisualLayers.Light, on ? "emergency_light_on" : "emergency_light_off");
-            sprite.LayerSetShader(EmergencyLightVisualLayers.Light, on ? "unshaded" : "shaded");
-
-            if (component.TryGetData(EmergencyLightVisuals.Color, out Color color))
-            {
-                sprite.LayerSetColor(EmergencyLightVisualLayers.Light, color);
-            }
-        }
-    }
-}
-
-public enum EmergencyLightVisualLayers
-{
-    Base,
-    Light
-}