Minz allow parallel sessions (#3096)

* Minz allow parallel sessions

#fix https://github.com/FreshRSS/FreshRSS/issues/3093

* Array optimisation

* Array optimisation missing

* Reduce direct access to $_SESSION except in install process

* Fix session start headers warning

* Use cookie only the first time the session is started:
`PHP Warning:  session_start(): Cannot start session when headers
already sent in /var/www/FreshRSS/lib/Minz/Session.php on line 39`

* New concept of volatile session for API calls

Optimisation: do not use cookies or local storage at all for API calls
without a Web session
Fix warning:

```
PHP Warning:  session_destroy(): Trying to destroy uninitialized session
in Unknown on line 0
```

* Only call Minz_Session::init once in our index

It was called twice (once indirectly via FreshRSS->init())

* Whitespace

* Mutex for notifications

Implement mutex for notifications
https://github.com/FreshRSS/FreshRSS/pull/3208#discussion_r499509809

* Typo

* Install script is not ready for using Minz_Session

1 files changed, 5 insertions, 3 deletions

diff --git a/app/Controllers/userController.php b/app/Controllers/userController.php
index 4dfd11751..06c9ebc04 100644
--- a/app/Controllers/userController.php
+++ b/app/Controllers/userController.php
@@ -350,9 +350,11 @@ class FreshRSS_user_Controller extends Minz_ActionController {
 			// get started immediately.
 			if ($ok && !FreshRSS_Auth::hasAccess('admin')) {
 				$user_conf = get_user_configuration($new_user_name);
-				Minz_Session::_param('currentUser', $new_user_name);
-				Minz_Session::_param('passwordHash', $user_conf->passwordHash);
-				Minz_Session::_param('csrf');
+				Minz_Session::_params([
+					'currentUser' => $new_user_name,
+					'passwordHash' => $user_conf->passwordHash,
+					'csrf' => false,
+				]);
 				FreshRSS_Auth::giveAccess();
 			}