[PHP] Remi + native multiPHP builds. Remi is simpler package-based at the cost of performance. Native builds have similar throughput to system PHP version (+10-15% over Remi) at the added cost of compilation. apache.php-multi Scope facilitates native builds. See PHP-FPM.md in release documentation. [PHP] correct PHP 7.4 configuration flag for GD [SpamAssassin] add X-Envelope-From header for SPF/DKIM checks which occur after SRS rewrite [CLI] errors always report to STDERR [Scopes] info() includes default Scope value [License] add support for network restrictions, domain limits