Add the DownloadItem.IsPaused property

This wraps the `CefDownloadItem::IsPaused()` from CEF 144 release.
See the `cef.sdk\cef\include\cef_download_item.h` file.

Author: jozefizso

CefSharp.Core.Runtime/Internals/TypeConversion.h

@@ -58,6 +58,7 @@ namespace CefSharp
                     item->IsInProgress = downloadItem->IsInProgress();
                     item->IsComplete = downloadItem->IsComplete();
                     item->IsCancelled = downloadItem->IsCanceled();
+                    item->IsPaused = downloadItem->IsPaused();
                     item->CurrentSpeed = downloadItem->GetCurrentSpeed();
                     item->PercentComplete = downloadItem->GetPercentComplete();
                     item->TotalBytes = downloadItem->GetTotalBytes();

CefSharp/DownloadItem.cs

@@ -31,6 +31,11 @@ public sealed class DownloadItem
         /// </summary>
         public bool IsCancelled { get; set; }
 
+        /// <summary>
+        /// Returns true if the download has been paused.
+        /// </summary>
+        public bool IsPaused { get; set; }
+
         /// <summary>
         /// Returns a simple speed estimate in bytes/s.
         /// </summary>