stack cleanup and mild refactoring (#11717)

* stack cleanup

* fix tests and ulong

* somehow did half a commit

* ulong got usmall. (it's ints now)

* sussy baka cleanup

* mirror's review

* make da tests pass again

* shadowcommander review

* sloth por favor

* Update StoreSystem.Ui.cs

Content.Server/Construction/MachineFrameSystem.cs

@@ -85,6 +85,8 @@ public sealed class MachineFrameSystem : EntitySystem
             if (TryComp<StackComponent?>(args.Used, out var stack))
             {
                 var type = stack.StackTypeId;
+                if (type == null)
+                    return;
                 if (!component.MaterialRequirements.ContainsKey(type))
                     return;
 
@@ -262,6 +264,8 @@ public sealed class MachineFrameSystem : EntitySystem
             {
                 var type = stack.StackTypeId;
                 // Check this is part of the requirements...
+                if (type == null)
+                    continue;
                 if (!component.MaterialRequirements.ContainsKey(type))
                     continue;