* Improves settings page UI/styles
* Improves content of email alerts
* Adds support for multiple email addresses
* Adds filter hook `blackhole_email_address`
* Adds `[login]` shortcut for custom email alerts
* Adds `$login` variable to hook `blackhole_alert_message`
* Adds `$login` variable to hook `blackhole_alert_custom`
* Adds `$login` variable to hook `blackhole_alert_default`
* Adds `$login` variable to hook `blackhole_alert_simple`
* Fixes incorrect function name, `blackhole_default_message`
* Moves Reset Reports link to Email Alerts settings
* Removes `require_once` from `blackhole_send_email()`
* Improves logic when calling `get_current_screen()`
* Adds license status message to plugin screens
* Improves handling of license activation
* Improves handling of license constants
* Updates Help tab inline documentation
* Improves logic for dates and times
* Generates new translation template
* Tests on WordPress 6.1 + 6.2 (beta)
* Tests on PHP 8.1 and 8.2