Make Every Class Internal

Util/OSNotification.cs

@@ -19,7 +19,7 @@ namespace ADOFAIRenderer.Util
     /// - <b>Linux</b>: Uses <c>notify-send</c> (libnotify) with <c>xdg-open</c> for folder actions.
     /// </para>
     /// </summary>
-    public static class OSNotification
+    internal static class OSNotification
     {
         /// <summary>
         /// Sends a native desktop notification.