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/EntityAnchored.cs

@@ -25,15 +25,21 @@ namespace Content.Server.Construction.Conditions
             return physics.Anchored == Anchored;
         }
 
-        public void DoExamine(IEntity entity, FormattedMessage message, bool inDetailsRange)
+        public bool DoExamine(IEntity entity, FormattedMessage message, bool inDetailsRange)
         {
-            if (!entity.TryGetComponent(out IPhysicsComponent physics)) return;
+            if (!entity.TryGetComponent(out IPhysicsComponent physics)) return false;
 
-            if(Anchored && !physics.Anchored)
-                message.AddMarkup("First, anchor it.\n");
+            switch (Anchored)
+            {
+                case true when !physics.Anchored:
+                    message.AddMarkup("First, anchor it.\n");
+                    return true;
+                case false when physics.Anchored:
+                    message.AddMarkup("First, unanchor it.\n");
+                    return true;
+            }
 
-            if(!Anchored && physics.Anchored)
-                message.AddMarkup("First, unanchor it.\n");
+            return false;
         }
     }
 }