merge netstandard into main (#26)

* #23

* #23 "Newtonsoft.Json" Version="10.0.2"

* owin

* AspNetCore

* Fix appveyor build

* fix start/stop in untitests

src/WireMock.Net/Owin/OwinResponseMapper.cs

@@ -0,0 +1,47 @@
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+#if NET45
+using Microsoft.Owin;
+#else
+using Microsoft.AspNetCore.Http;
+#endif
+
+namespace WireMock.Owin
+{
+    /// <summary>
+    /// OwinResponseMapper
+    /// </summary>
+    public class OwinResponseMapper
+    {
+        private readonly Encoding _utf8NoBom = new UTF8Encoding(false);
+
+        /// <summary>
+        /// MapAsync ResponseMessage to OwinResponse
+        /// </summary>
+        /// <param name="responseMessage"></param>
+        /// <param name="response"></param>
+        public async Task MapAsync(ResponseMessage responseMessage
+#if NET45
+            , IOwinResponse response
+#else
+            , HttpResponse response
+#endif
+            )
+        {
+            response.StatusCode = responseMessage.StatusCode;
+
+            responseMessage.Headers.ToList().ForEach(pair => response.Headers.Append(pair.Key, pair.Value));
+
+            if (responseMessage.Body == null)
+                return;
+
+            Encoding encoding = responseMessage.BodyEncoding ?? _utf8NoBom;
+            using (var writer = new StreamWriter(response.Body, encoding))
+            {
+                await writer.WriteAsync(responseMessage.Body);
+            }
+        }
+    }
+}