Makes construction graphs turing complete (#3516)

* Makes construction graphs turing complete

* Improvements

Content.Server/Construction/Completions/PopupEveryone.cs

@@ -0,0 +1,20 @@
+#nullable enable
+using System.Threading.Tasks;
+using Content.Server.Utility;
+using Content.Shared.Construction;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Construction.Completions
+{
+    [DataDefinition]
+    public class PopupEveryone : IGraphAction
+    {
+        [field: DataField("text")] public string Text { get; } = string.Empty;
+
+        public async Task PerformAction(IEntity entity, IEntity? user)
+        {
+            entity.PopupMessageEveryone(Text);
+        }
+    }
+}