Upgradeable machines. (#2675)

* Start work on upgradeable machines.

* Upgradeable machines work

* Component requirements for upgradeable machines

* Better container handling

* Remember to not push submodule updates in your PRs, kids!

* Refresh parts after building a machine.

* NetSync false

* Address some reviews, fix some bugs

* Nullable stackhelpers dependencies

* Use container helper method to delete all entities in containers

* Nullable string in AddContainer

* Better examine for machine frame and construction in general

* Machine breakage

* Nullable node

* nullable GraphPrototype

* Re-save saltern for autolathe parts

* Fix SaveLoadSave

Content.Server/Construction/Conditions/AllWiresCut.cs

@@ -0,0 +1,46 @@
+using System.Threading.Tasks;
+using Content.Server.GameObjects.Components;
+using Content.Server.GameObjects.Components.Power;
+using Content.Shared.Construction;
+using JetBrains.Annotations;
+using Robust.Shared.Interfaces.GameObjects;
+using Robust.Shared.Serialization;
+
+namespace Content.Server.Construction.Conditions
+{
+    /// <summary>
+    ///     A condition that requires all wires to be cut (or intact)
+    ///     Returns true if the entity doesn't have a wires component.
+    /// </summary>
+    [UsedImplicitly]
+    public class AllWiresCut : IEdgeCondition
+    {
+        public void ExposeData(ObjectSerializer serializer)
+        {
+            serializer.DataField(this, x => x.Value, "value", true);
+        }
+
+        public bool Value { get; private set; } = true;
+
+        public async Task<bool> Condition(IEntity entity)
+        {
+            if (entity.Deleted)
+                return false;
+
+            if (!entity.TryGetComponent<WiresComponent>(out var wires))
+                return true;
+
+            foreach (var wire in wires.WiresList)
+            {
+                switch (Value)
+                {
+                    case true when !wire.IsCut:
+                    case false when wire.IsCut:
+                        return false;
+                }
+            }
+
+            return true;
+        }
+    }
+}