[concrete5] [v8]Add logging handler

app.php

<?php
/** @var \Concrete\Core\Logging\Logger $logger */
$logger = $app->make('log');
$logger->pushHandler(new \Application\Logging\Handler\ConcreteMailerHandler(
    'example@example.com', 'Error Notification', 'example@example.com', \Concrete\Core\Logging\Logger::ERROR));

autoload.php

<?php
$classLoader = new \Symfony\Component\ClassLoader\Psr4ClassLoader();
$classLoader->addPrefix('Application\\Logging', DIR_APPLICATION . '/' . DIRNAME_CLASSES . '/Logging');
$classLoader->register();

ConcreteMailerHandler.php

<?php
namespace Application\Logging\Handler;

use Concrete\Core\Logging\Logger;
use Concrete\Core\Mail\Service;
use Concrete\Core\Support\Facade\Application;
use Monolog\Handler\MailHandler;

class ConcreteMailerHandler extends MailHandler
{
    protected $to;
    protected $subject;
    protected $from;

    public function __construct($to, $subject, $from, $level = Logger::ERROR, $bubble = true)
    {
        parent::__construct($level, $bubble);
        $this->to = is_array($to) ? $to : array($to);
        $this->subject = $subject;
        $this->from = $from;
    }

    /**
     * @inheritDoc
     */
    protected function send($content, array $records)
    {
        $app = Application::getFacadeApplication();
        /** @var Service $mh */
        $mh = $app->make('mail');
        foreach ($this->to as $to) {
            $mh->to($to);
        }
        if ($this->subject) {
            $mh->setSubject($this->subject);
        }
        if ($this->from) {
            $mh->from($this->from);
        }
        $mh->setBody($content);
        $mh->sendMail();
    }

}