More modernization

- Split generic "common" libraries into specific libraries
- Use other packages in lieu of custom code
- General cleanup

Application/Options/AboutOptionsPanel.xaml.cs

@@ -1,4 +1,4 @@
-using Common.Update;
+using CKaczor.ApplicationUpdate;
 using System.Reflection;
 
 namespace FeedCenter.Options
@@ -33,4 +33,4 @@ namespace FeedCenter.Options
 
         public override string CategoryName => Properties.Resources.optionCategoryAbout;
     }
-}
+}