Migrate to new tribufu project structure

Source/Tribufu.Serialization/BaseClassFirstContractResolver.cs

@@ -0,0 +1,20 @@
+// Copyright (c) Tribufu. All Rights Reserved.
+// SPDX-License-Identifier: UNLICENSED
+
+using Newtonsoft.Json;
+using Newtonsoft.Json.Serialization;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Tribufu.Serialization
+{
+    public class BaseClassFirstContractResolver : DefaultContractResolver
+    {
+        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
+        {
+            var props = base.CreateProperties(type, memberSerialization);
+            return props.OrderBy(p => { return p.DeclaringType == type ? 1 : 0; }).ToList();
+        }
+    }
+}