title: How to change default location of created entities ? (php bin/console make:entity)
body: <p>I want to change default location of entities in Symfony4: when I launch the command <code>php bin/console make:entity</code>, it automatically creates a new file in the namespace <strong>App\Entity</strong>. 
  I want to create it in another namespace, like <strong>App\Appli\Entity</strong> by example. </p>
  
  <p>I have already tried to change the following files without any changes.</p>
  
  <ul>
  <li>doctrine.yaml </li>
  <li>EntityGenerator.php </li>
  </ul>
  
  <p>I also threw an eye on <code>make:entity --help</code>, but it doesn't seem that we can set any path. </p>
  
  <p>In the <em>doctrine.yaml</em>, I've added this code: </p>
  
  <pre><code>mappings:
     Appli:
          is_bundle: false
          type: annotation
          dir: '%kernel.project_dir%/src/Appli'
          prefix: 'App\Appli\Entity'
          alias: Appli        
  </code></pre>
  
  <p>I want to create a new Entity in the folder  <strong>src/Appli/Entity</strong>  with the command line <code>php bin/console make:entity</code>, but it always created it in the folder  <strong>src/Entity</strong>  !!</p>