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/class-loader/Tests/Fixtures/ClassesWithParents/BTrait.php

@@ -0,0 +1,8 @@
+<?php
+
+namespace ClassesWithParents;
+
+trait BTrait
+{
+    use ATrait;
+}