Function: Builds the `learndash_login` shortcode output.
Filter Hook: Filters learndash_login shortcode attributes.
Filter Hook: Filters the login URL that a user will be sent to for login. This filter can also be used for logout URL the user will be sent to after the logout action.
Filter Hook: Filters the filter arguments depending on the action which is login and logout.
Function: Builds the `learndash_user_status` shortcode output.