Add disposal signalers (#37535)

* Add disposal signalers

* Sprite changes

* Some requested changes

* Requested changes + change spelling to be with two l's to be consistent with the remote signaller

Content.Server/Disposal/Tube/DisposalSignallerSystem.cs

@@ -0,0 +1,25 @@
+using Content.Server.DeviceLinking.Systems;
+
+namespace Content.Server.Disposal.Tube;
+
+public sealed class DisposalSignallerSystem : EntitySystem
+{
+    [Dependency] private readonly DeviceLinkSystem _link = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<DisposalSignallerComponent, ComponentInit>(OnInit);
+        SubscribeLocalEvent<DisposalSignallerComponent, GetDisposalsNextDirectionEvent>(OnGetNextDirection, after: new[] { typeof(DisposalTubeSystem) });
+    }
+
+    private void OnInit(EntityUid uid, DisposalSignallerComponent comp, ComponentInit args)
+    {
+        _link.EnsureSourcePorts(uid, comp.Port);
+    }
+
+    private void OnGetNextDirection(EntityUid uid, DisposalSignallerComponent comp, ref GetDisposalsNextDirectionEvent args)
+    {
+        _link.InvokePort(uid, comp.Port);
+    }
+}