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

src/Module/Logout.php

@@ -10,6 +10,7 @@ use Friendica\Core\Authentication;
 use Friendica\Core\Cache;
 use Friendica\Core\Hook;
 use Friendica\Core\L10n;
+use Friendica\Core\Session;
 use Friendica\Core\System;
 use Friendica\Model\Profile;
 
@@ -32,7 +33,7 @@ class Logout extends BaseModule
 		}
 
 		Hook::callAll("logging_out");
-		Authentication::deleteSession();
+		Session::delete();
 
 		if ($visitor_home) {
 			System::externalRedirect($visitor_home);