Refactor stacks to use prototypes (#3387)

* Refactor stacks to use prototypes

* Fix not assigned warning

* Add names to stacks

* Make machine baords and material constructions use the name as well

* Remove defaulting stacks to prototype id

* Fix tests

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>

Content.Shared/Stacks/StackPrototype.cs

@@ -0,0 +1,33 @@
+#nullable enable
+using Robust.Shared.Prototypes;
+using Robust.Shared.Serialization;
+using Robust.Shared.Utility;
+using YamlDotNet.RepresentationModel;
+
+namespace Content.Shared.Stacks
+{
+    [Prototype("stack")]
+    public class StackPrototype : IPrototype
+    {
+        public string ID { get; private set; } = string.Empty;
+
+        public string Name { get; private set; } = string.Empty;
+
+        public SpriteSpecifier? Icon { get; private set; }
+
+        /// <summary>
+        ///     The entity id that will be spawned by default from this stack.
+        /// </summary>
+        public string? Spawn { get; private set; }
+
+        public void LoadFrom(YamlMappingNode mapping)
+        {
+            var reader = YamlObjectSerializer.NewReader(mapping);
+
+            reader.DataField(this, x => x.ID, "id", string.Empty);
+            reader.DataField(this, x => x.Name, "name", string.Empty);
+            reader.DataField(this, x => x.Icon, "icon", null);
+            reader.DataField(this, x => x.Spawn, "spawn", null);
+        }
+    }
+}