Refactor settings and enhance download manager

Refactor application to use SettingService for managing settings.
Update project to target Windows desktop application.
Enhance DownloadManagerService for better task handling.
Add new dependencies and remove obsolete settings files.
Improve UI feedback and notifications for user actions.

Models/UrlGetter/YandeUrlGetter.cs

@@ -13,6 +13,9 @@ public class YandeUrlGetter : IUrlGetter
 
     public async Task<FileUrl> GetFileUrl(string taskUrl)
     {
+        if (!taskUrl.StartsWith("https://yande.re/post/show/"))
+            return new FileUrl(null, null, null);
+
         // Get the ID of the post from the URL
         var id = taskUrl.Split("https://yande.re/post/show/").Last();