WP Mail SMTP Pro 4.2.0

### Added:
- Email Log: store email attachments.
- Email Log: export email logs in EML format.
- Email Log: archive email log table column filters in screen options.
- Email Log: aggregated email log view on Network Admin Email Log page.
- Email Log: resend emails.
- Email Log: open and click tracking.
- Action Scheduler table to the Tools page.
- Dashboard Widget with total emails sent counter (Lite only).

### Changed:
- Notifications design.
- Sodium Compat library loading improved.
- Improved the Zoho Mail OAuth error detection.
- Removed the ability to set dynamic reply-to address for Zoho Mail because they don't support it.

### Fixed:
- Plugin conflict with plugins that populate $_POST data (Ultimate Addons for Elementor, WishList Member, ...).
- Sendinblue WooCommerce Email Marketing plugin conflict admin notice display.
- Email Log: empty email logs caused by sent status verification tasks.
- jQuery deprecated notices.
- Action Scheduler library loading issue.
- Canceled Setup Wizard's OAuth authorization redirecting to the Setup Wizard when connecting via regular plugin settings.
- Meta DB table not existing error notices on a WP Multisite subsite.

### Added:
- Email Log: export email logs in CSV and XLSX (Excel) formats.
- Email Log: print email log.
- Email Log: date range filter control.
- Email Log: filter hook for changing required WP capabilities to view and manage Email Logs.
- Email Log: settings constants.
- Filter hooks for the Outlook mailer URLs, enabling GCC High compatibility.
- WP Site Health status check for the sending domain.
- WP Mail SMTP WordPress admin menu position filter hook.

### Changed:
- Updated the single Email Log page style.
- Updated the list of conflicting plugins.
- Moved the Email Test tab to the new WP Mail SMTP > Tools page.

### Fixed:
- Removed the empty admin dashboard menu item for the Setup Wizard.
- The Setup Wizard conflicting issue with Admin 2020 plugin.
- The plugin settings pages not opening when WishList Member plugin was active.
- Empty error message for Outlook mailer.
- Dashboard Widget missing database table error when Email Logging was never enabled.
- Mailgun mailer sent status verification task accuracy.

### IMPORTANT
- Support for PHP 5.5 has been discontinued. If you are running one of those versions, you MUST upgrade PHP before installing or upgrading to WP Mail SMTP v2.7. Failure to do that will disable WP Mail SMTP functionality.

### Added:
- Dashboard widget with email sending statistic.
- Email Log: email sent status filters.

### Changed:
- Updated About us plugin page.
- Improved Domain Check Results section in Email Test tab.
- Allow the use of different Gmail aliases as From Email address by disabling the Force From Email setting.
- The Setup Wizard can now be launched via a button in the plugin settings. The Setup Wizard admin dashboard menu item was removed.

### Fixed:
- WP Multisite subsite admins couldn't remove oAuth connections (in Gmail, Outlook and Zoho mailers).
- Accessible WPMS subsite settings when network-wide setting was enabled.