Introduce a new `Users` class to handle scheduled tasks for user status checks and batch processing. Refactor user approval functionality to allow silent operations and avoid sending notifications where unnecessary. Enhance user registration to prevent unfinished registrations from being processed in scheduled checks.
* updated filters by status, avoid slow queries for getting users count;
* updated bulk-actions for changing statuses (moved to WP native dropdown)
* separate handlers for changing user statuses on wp-admin and frontend (partially implemented);
* created class UM()->common()->users() to handle user statuses in more clear format;
* deprecated old hooks and old functions
Mykyta Synelnikov