Added ConfigureAwait(false) after GetAsync method of HttpClient to le…

…t the code after the callback (await) run in the same thread as created in the GetAsync method. By default this is not the case and when running this code on the UI thread it will cause the UI thread to hang (deadlock).

MdXaml/ImageLoaderManager.cs

@@ -104,7 +104,7 @@ private static async Task<Result<Stream>> OpenStreamAsync(Uri resourceUrl)
             {
                 case "http":
                 case "https":
-                    var httpResult = await s_client.GetAsync(resourceUrl);
+                    var httpResult = await s_client.GetAsync(resourceUrl).ConfigureAwait(false);
                     if (httpResult.StatusCode == HttpStatusCode.OK)
                     {
                         var webstream = await httpResult.Content.ReadAsStreamAsync();