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/polyfill-php70/Resources/stubs/SessionUpdateTimestampHandlerInterface.php

@@ -0,0 +1,23 @@
+<?php
+
+interface SessionUpdateTimestampHandlerInterface
+{
+    /**
+     * Checks if a session identifier already exists or not.
+     *
+     * @param string $key
+     *
+     * @return bool
+     */
+    public function validateId($key);
+
+    /**
+     * Updates the timestamp of a session when its data didn't change.
+     *
+     * @param string $key
+     * @param string $val
+     *
+     * @return bool
+     */
+    public function updateTimestamp($key, $val);
+}