Notifications about events on the site

The functionality of the plugin is as follows. The user receives personal notifications аbout:

1. Adding a post to his blog.
2. Adding a post to his club's blog.
3. Adding an entry on his profile wall.
4. Adding an entry on the wall of his club.
5. Reply to his comment.
6. A new comment to his post.
7. A new comment to a post on his blog.
8. A new comment on his club's blog post.

All notifications are disabled in the admin panel.
If a user receives a notification about a response to his comment, he will not receive any other notifications about this event.

During the creation of the plugin, not a single animal, not a single system file was affected.
The plugin installation is standard. Copy the contents of the archive to the root of the site, install the plugin in the admin panel and include it in the list of plugins.