Matomo Integration 5.2

Fixed: Matomo data is removed when a managed site is deleted.
Added: Matomo management through MainWP Abilities.
Added: Scheduled processing for Matomo management requests.
Added: Deleting the extension removes the saved Matomo connection, the tables this extension created, and its options and scheduled tasks.
Updated: Matomo connection settings and existing site data are migrated for the new management features.
Updated: Client Reports and Pro Reports Matomo tokens now get six summary values: nb_visits, nb_actions, nb_actions_per_visit, bounce_rate, nb_uniq_visitors, and avg_time_on_site. Version 5.1.2 returned more.
Updated: Those report requests now also work for users without the Matomo extension capability, still subject to site access, Team Control, and a connected Matomo assignment.
Updated: TLS certificates are always verified. The old mainwp_piwik_sslVerifyCertificate option is no longer honored, and plain-http Matomo URLs are not supported.
Updated: A Matomo connection has to be an https address at the site root, and the saved token is kept out of the settings row.
Updated: After an update, an administrator has to open wp-admin once before Matomo requests made outside wp-admin can use the new storage.