[feature/avatars] Move avatar specific settings to drivers

PHPBB3-10018

phpBB/includes/avatar/driver/remote.php

@@ -58,6 +58,16 @@ class phpbb_avatar_driver_remote extends phpbb_avatar_driver
 		return true;
 	}
 
+	/**
+	* @inheritdoc
+	**/
+	public function prepare_form_acp()
+	{
+		return array(
+			'allow_avatar_remote'	=> array('lang' => 'ALLOW_REMOTE',			'validate' => 'bool',	'type' => 'radio:yes_no', 'explain' => true),
+		);
+	}
+
 	/**
 	* @inheritdoc
 	*/