Refactor "Authentication" class with four main methods:

- withSession() - for auto authentication with Session/Cookie variables
- withOpenId() - for authentication with an OpenID account
- withPassword() - for authentication with Password
- setForUser() - for setting the user auth context of the current session

Refactor "Session" class - contains now "native" Session Management methods

mod/dfrn_poll.php

@@ -5,6 +5,7 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
 use Friendica\Core\Authentication;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
@@ -21,7 +22,9 @@ use Friendica\Util\XML;
 
 function dfrn_poll_init(App $a)
 {
-	Authentication::sessionAuth();
+	/** @var Authentication $authentication */
+	$authentication = BaseObject::getClass(Authentication::class);
+	$authentication->withSession($a, $_COOKIE);
 
 	$dfrn_id         =  $_GET['dfrn_id']         ?? '';
 	$type            = ($_GET['type']            ?? '') ?: 'data';

mod/openid.php

@@ -4,6 +4,8 @@
  */
 
 use Friendica\App;
+use Friendica\BaseObject;
+use Friendica\Core\Authentication;
 use Friendica\Core\Config;
 use Friendica\Core\L10n;
 use Friendica\Core\Logger;
@@ -45,7 +47,9 @@ function openid_content(App $a) {
 
 				unset($_SESSION['openid']);
 
-				Session::setAuthenticatedForUser($a, $user, true, true);
+				/** @var Authentication $authentication */
+				$authentication = BaseObject::getClass(Authentication::class);
+				$authentication->setForUser($a, $user, true, true);
 
 				// just in case there was no return url set
 				// and we fell through