Move BarSign appearance logic to client. (#11524)

* git mv

* Client-side bar sign appearance

* fix yaml

Content.Shared/BarSign/BarSignComponent.cs

@@ -0,0 +1,24 @@
+using Robust.Shared.GameStates;
+using Robust.Shared.Serialization;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Shared.BarSign
+{
+    [RegisterComponent, NetworkedComponent]
+    public sealed class BarSignComponent : Component
+    {
+        [DataField("current", customTypeSerializer:typeof(PrototypeIdSerializer<BarSignPrototype>))]
+        public string? CurrentSign;
+    }
+
+    [Serializable, NetSerializable]
+    public sealed class BarSignComponentState : ComponentState
+    {
+        public string? CurrentSign;
+
+        public BarSignComponentState(string? current)
+        {
+            CurrentSign = current;
+        }
+    }
+}