Tile proto parenting

Content.Shared/Maps/ContentTileDefinition.cs

@@ -12,11 +12,18 @@ namespace Content.Shared.Maps
 {
     [UsedImplicitly]
     [Prototype("tile")]
-    public sealed class ContentTileDefinition : IPrototype, ITileDefinition
+    public sealed class ContentTileDefinition : IPrototype, IInheritingPrototype, ITileDefinition
     {
         [ViewVariables]
         string IPrototype.ID => Name;
 
+        [DataField("parent", customTypeSerializer:typeof(PrototypeIdSerializer<ContentTileDefinition>))]
+        public string? Parent { get; private set; }
+
+        [NeverPushInheritance]
+        [DataField("abstract")]
+        public bool Abstract { get; private set; }
+
         public string Path => "/Textures/Tiles/";
 
         [DataField("name", required: true)] public string Name { get; } = string.Empty;