Feature: Sync MWS Shipment with Database

Various restructuring and misc. features added.
Removed reliance on ABrain Amazon MWS NuGet package, added Amazon's own C# lib

src/bnhtrade.Core/Model/SKU/SKUInfo.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace bnhtrade.Core.Model.SKU
+{
+    class SKUInfo
+    {
+        public string SkuNumber { get; set; }
+        public string AmazonFNSKU { get; set; }
+        public bool IsActive { get; set; }
+    }
+}