* Feature #307 : New windows setting to use cover art as folder's icon. Incomplete. Need to add to avalonia settings

* Interop refactor

Source/LibationFileManager/WindowsDirectory.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace LibationFileManager
+{
+    public static class WindowsDirectory
+    {
+        public static void SetCoverAsFolderIcon(string pictureId, string directory)
+        {
+            try
+            {
+                if (!Configuration.Instance.UseCoverAsFolderIcon || !Configuration.IsWindows)
+                    return;
+
+                // get path of cover art in Images dir. Download first if not exists
+                var coverArtPath = PictureStorage.GetPicturePathSynchronously(new(pictureId, PictureSize._300x300));
+
+                InteropFactory.Create().SetFolderIcon(image: coverArtPath, directory: directory);
+            }
+            catch (Exception ex)
+            {
+                // Failure to 'set cover as folder icon' should not be considered a failure to download the book
+                Serilog.Log.Logger.Error(ex, "Error setting cover art as folder icon. {@DebugInfo}", new { directory });
+
+                try
+                {
+                    InteropFactory.Create().DeleteFolderIcon(directory);
+                }
+                catch
+                {
+                    Serilog.Log.Logger.Error(ex, "Error rolling back: setting cover art as folder icon. {@DebugInfo}", new { directory });
+                }
+            }
+        }
+    }
+}