Symfony 5 support

[oldy777]

@vitorbrandao Hi! Do you have plans to add sf5 support?
I faced some problems trying to adopt it for sf5.

1. There is no tempting section in framework config, so you need use SmartyEngin directly

- templating:
-     engines: ['smarty']

2. There is not kernel.root_dir var. Now we have kernel.project_dir. And default folder is templates
3. Small change we need in \NoiseLabs\Bundle\SmartyBundle\Extension\SecurityExtension

- return $this->authorizationChecker->isGranted($role, $object);
+ try {
+            return $this->authorizationChecker->isGranted($role, $object);
+       } catch (AuthenticationCredentialsNotFoundException $e) {
+            return false;
+        }

4. EngineInterface namespace changed;

- use Symfony\Bundle\FrameworkBundle\Templating\EngineInterface;
+ use Symfony\Component\Templating\EngineInterface;

5. Symfony\Bundle\FrameworkBundle\CacheWarmer\TemplateFinderInterface removed without replacement
6. The biggest problem FileLocator interface changed. Now we can't inject anything in FileLocator except $kernel

class FileLocatorFactory
{
    /**
     * @param KernelInterface $kernel A KernelInterface instance
     * @param null|string     $path   The path the global resource directory
     * @param array           $paths  An array of paths where to look for resources
     */
    public static function createFileLocator(KernelInterface $kernel, ?string $path, array $paths, array $extraTemplatePaths): FileLocator
    {
        return new FileLocator($kernel, /**$path, array_merge($paths, $extraTemplatePaths)*/);
    }
}

7. Small problems with tests. They can be easily solved except this problem with FileLocator

[vitorbrandao]

Hi, @oldy777. I've started working on sf5 in this PR but it's not a trivial task as they have dropped the built-in support for multiple templating engines. I'll get in touch with the core team.

My plan is to release a stable 4.0 SmartyBundle release this month then have the master branch free for sf5 support work.