N°2435.1 Portal: Split portal composer.json in 2

- Autoloader for portal files in the itop-portal-base module
- Dependencies moved to root composer.json
- Add autoloader for /core and /application content

lib/symfony/twig-bundle/Tests/DependencyInjection/Fixtures/php/customTemplateEscapingGuesser.php

@@ -0,0 +1,6 @@
+<?php
+
+$container->loadFromExtension('twig', [
+    'autoescape_service' => 'my_project.some_bundle.template_escaping_guesser',
+    'autoescape_service_method' => 'guess',
+]);