Simplifying Machine Upgrading (#15802)

Content.Shared/Construction/Prototypes/MachinePartPrototype.cs

@@ -14,9 +14,15 @@ public sealed class MachinePartPrototype : IPrototype
     [IdDataField]
     public string ID { get; } = default!;
 
+    /// <summary>
+    /// A human-readable name for the machine part type.
+    /// </summary>
+    [DataField("name")]
+    public readonly string Name = string.Empty;
+
     /// <summary>
     /// A stock part entity based on the machine part.
     /// </summary>
-    [DataField("stockPartPrototype", customTypeSerializer: typeof(PrototypeIdSerializer<EntityPrototype>))]
-    public string? StockPartPrototype { get; }
+    [DataField("stockPartPrototype", customTypeSerializer: typeof(PrototypeIdSerializer<EntityPrototype>), required: true)]
+    public readonly string StockPartPrototype = string.Empty;
 }