Generalized material spawning (#12489)

Content.Shared/Materials/MaterialPrototype.cs

@@ -1,8 +1,7 @@
-using Content.Shared.Stacks;
 using Robust.Shared.Prototypes;
+using Robust.Shared.Utility;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype;
 using Robust.Shared.Serialization.TypeSerializers.Implementations.Custom.Prototype.Array;
-using Robust.Shared.Utility;
 
 namespace Content.Shared.Materials
 {
@@ -13,8 +12,6 @@ namespace Content.Shared.Materials
     [Prototype("material")]
     public sealed class MaterialPrototype : IPrototype, IInheritingPrototype
     {
-        private string _name = string.Empty;
-
         [ViewVariables]
         [ParentDataField(typeof(AbstractPrototypeIdArraySerializer<MaterialPrototype>))]
         public string[]? Parents { get; }
@@ -27,11 +24,16 @@ namespace Content.Shared.Materials
         [IdDataFieldAttribute]
         public string ID { get; } = default!;
 
-        [DataField("stack", customTypeSerializer:typeof(PrototypeIdSerializer<StackPrototype>))]
-        public string? StackId { get; } = null;
+        /// <summary>
+        ///     For material storage to be able to convert back and forth
+        ///     between the material and physical entities you can carry,
+        ///     include which stack we should spawn by default.
+        /// </summary>
+        [DataField("stackEntity", customTypeSerializer:typeof(PrototypeIdSerializer<EntityPrototype>))]
+        public string StackEntity { get; } = "";
 
         [DataField("name")]
-        public string Name { get; private set; } = "";
+        public string Name = "";
 
         [DataField("color")]
         public Color Color { get; } = Color.Gray;