Allow to use "symfony/mailer" within Mailer

[phansys]

Subject

Allow to use "symfony/mailer" within Mailer.

I am targeting this branch, because this change respects BC.

Closes #1193.

Changelog

### Added
- Support for "symfony/mailer" in `Sonata\UserBundle\Mailer\Mailer`.
### Deprecated
- Support for "swiftmailer/swiftmailer" in `Sonata\UserBundle\Mailer\Mailer`.

To do

• Update the tests;
• Add an upgrade note.

[jordisala1991]

Nice one! Dont we have to change the DI to inject the symfony mailer?

[jordisala1991]

What about using templateEmail to have direct support for twig using the template name?

[phansys]

I think it will not possible in a transparent way, since the Twig template is currently providing the subject and the body:

$renderedLines = preg_split('/\R/', trim($rendered), 2, PREG_SPLIT_NO_EMPTY);
        $subject = array_shift($renderedLines);
        $body = implode('', $renderedLines);

[phansys]

Dont we have to change the DI to inject the symfony mailer?

I think there is no need to change the DI, since the service sonata.user.mailer.default is expecting the mailer service as argument 3, and the symfony/framework-bundle is registering this service when the symfony/mailer component is installed and the framework.mailer configuration is enabled.

SonataUserBundle/src/Resources/config/mailer.xml

Lines 4 to 10 in 7ec48dc

	<service id="sonata.user.mailer.default" class="Sonata\UserBundle\Mailer\Mailer">
	<argument type="service" id="router"/>
	<argument type="service" id="twig"/>
	<argument type="service" id="mailer"/>
	<argument>%fos_user.resetting.email.from_email%</argument>
	<argument>%fos_user.resetting.email.template%</argument>
	</service>

[phansys]

Since in my projects I'm using symfony/mailer and symfony/framework-bundle (which overrides the mailer service registered previously by swiftmailer/swiftmailer, it also resolves the following exception:

Invalid definition for service "Sonata\UserBundle\Action\SendEmailAction": argument 3 of "Sonata\UserBundle\Mailer\Mailer::__construct" accepts "Swift_Mailer", "Symfony\Component\Mailer\Mailer" passed.

[phansys]

Friendly ping @jordisala1991.

[SonataCI]

Ok @phansys,

I requested a new release for SonataUserBundle via Slack in #releases channel 👍

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