建议 Websocket 增加断开连接时自动取消订单的命令

the `CancelOrdersOnDisconnect=Y` is a good feature

the `CancelOrdersOnDisconnect=Y` is a good feature

they really should add it to websocket. add a `get_connection_order_group` command, returns a new `order_group_id` that, instead of triggering based on fill velocity, triggers on disconnect

they really should add it to websocket. add a `get_connection_order_group` command, returns a new `order_group_id` that, instead of triggering based on fill velocity, triggers on disconnect