Device Linking and better linking ui (#13645)

Co-authored-by: AJCM-git <60196617+AJCM-git@users.noreply.github.com>
Co-authored-by: Visne <39844191+Visne@users.noreply.github.com>
Co-authored-by: ElectroJr <leonsfriedrich@gmail.com>
Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/DeviceLinking/Components/SignallerComponent.cs

@@ -0,0 +1,18 @@
+using Content.Shared.MachineLinking;
+using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
+
+namespace Content.Server.DeviceLinking.Components
+{
+    /// <summary>
+    /// Sends out a signal to machine linked objects.
+    /// </summary>
+    [RegisterComponent]
+    public sealed class SignallerComponent : Component
+    {
+        /// <summary>
+        ///     The port that gets signaled when the switch turns on.
+        /// </summary>
+        [DataField("port", customTypeSerializer: typeof(PrototypeIdSerializer<TransmitterPortPrototype>))]
+        public string Port = "Pressed";
+    }
+}