* New Feature: Create a new nav menu item for showing username. (if user is Login)
* Enhancement: Added a filter `login_logout_menu_login` to change the Login URL.
* Enhancement: Added a filter `login_logout_menu_logout` to change the Logout URL.
* Enhancement: Added a filter `login_logout_menu_profile` to change the Profile page URL.
* Enhancement: Added a filter `login_logout_menu_register` to change the Registration page URL.
* Enhancement: Added a filter `login_logout_menu_username` to change the Username.
* Enhancement: Added a filter `login_logout_menu_username_url` to change the Username URL.
* Compatibility: Compatible with WordPress 5.7.
* Compatibility: Compatible with PHP 8.0.