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.Shared/DeviceLinking/TwoWayLeverSignal.cs

@@ -0,0 +1,18 @@
+using Robust.Shared.Serialization;
+
+namespace Content.Shared.DeviceLinking
+{
+    [Serializable, NetSerializable]
+    public enum TwoWayLeverVisuals : byte
+    {
+        State
+    }
+
+    [Serializable, NetSerializable]
+    public enum TwoWayLeverState : byte
+    {
+        Middle,
+        Right,
+        Left
+    }
+}