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/console/Tests/Fixtures/input_argument_2.json

@@ -0,0 +1,7 @@
+{
+    "name": "argument_name",
+    "is_required": false,
+    "is_array": true,
+    "description": "argument description",
+    "default": []
+}