Use namespaces to avoid class name conflicts

[lcobucci]

Allowing for applications to build multiple containers using configurations and namespaces.

This breaks BC for making it mandatory and for changing the way the dump directory is used.

Upgrading

Specify a namespace when creating the container builder. Tip: Make sure your config file is namespaced and use __NAMESPACE__ to create the builder:

declare(strict_types=1);

namespace Me\MyApplication\Config;

use Lcobucci\DependencyInjection\ContainerBuilder;

require __DIR__ . '/../vendor/autoload.php';

// $builder = new ContainerBuilder(); // v5.x initialisation
// $builder = ContainerBuilder::default(__FILE__); // v6.x initialisation
$builder = ContainerBuilder::default(__FILE__, __NAMESPACE__);