- improved "Redis" cache handler. Switched to persistent connection

- improved "Redis" info panels on `/setup` page, added "connected clients" and "blocked clients" data
- improved DB connection. Switched to persistent connection (configurable in `pathfinder.ini`)
- fixed some PHP errors after "Cortex" upgrade

app/main/controller/controller.php

@@ -152,7 +152,6 @@ class Controller {
                 new DB\SQL\MySQL\Session($this->getDB('PF'), 'sessions', true, $onSuspect);
             }
         }
-
     }
 
     /**