public static function set($key, $value)
    {
        $parts   = explode('.', $key);
        $config  = [];
        $current = &$config;
        foreach ($parts as $part) {
            $current[$part] = [];
            $current        = &$current[$part];
        }
        $current = $value;
        Application::$instance->appendConfiguration($config);
    }