- remove \Tizo\Framework::$config['functions']['error'] value

 - remove \Tizo\Framework::$config['functions'][exception'] value
 - new \Tizo\Framework::$config['error_handler'] value
 - new \Tizo\Framework::$config['exception_handler'] value
 - new \Tizo\Framework::$error_handler variable
 - new \Tizo\Framework::$exception_handler variable
 - new \Tizo\Framework::error_handler() method
 - new \Tizo\Framework::exception_handler() method
 - remove \Tizo\Framework::error_and_exception_handler() method