Makes construction graphs turing complete (#3516)

* Makes construction graphs turing complete

* Improvements

Content.Server/Construction/Completions/MoveContainer.cs

@@ -0,0 +1,34 @@
+#nullable enable
+using System.Linq;
+using System.Threading.Tasks;
+using Content.Shared.Construction;
+using JetBrains.Annotations;
+using Robust.Shared.Containers;
+using Robust.Shared.GameObjects;
+using Robust.Shared.Serialization.Manager.Attributes;
+
+namespace Content.Server.Construction.Completions
+{
+    [UsedImplicitly]
+    [DataDefinition]
+    public class MoveContainer : IGraphAction
+    {
+        [field: DataField("from")] public string? FromContainer { get; } = null;
+        [field: DataField("to")] public string? ToContainer { get; } = null;
+
+        public async Task PerformAction(IEntity entity, IEntity? user)
+        {
+            if (string.IsNullOrEmpty(FromContainer) || string.IsNullOrEmpty(ToContainer))
+                return;
+
+            var from = entity.EnsureContainer<Container>(FromContainer);
+            var to = entity.EnsureContainer<Container>(ToContainer);
+
+            foreach (var contained in from.ContainedEntities.ToArray())
+            {
+                if (from.Remove(contained))
+                    to.Insert(contained);
+            }
+        }
+    }
+}