m-HD

Added get_spot_delist_schedule for [Get symbols delist schedule for spot](https://binance-docs.github.io/apidocs/spot/en/#get-symbols-delist-schedule-for-spot-market_data). Added get_margin_delist_schedule for [Get tokens or symbols delist schedule for cross margin and isolated margin](https://binance-docs.github.io/apidocs/spot/en/#get-tokens-or-symbols-delist-schedule-for-cross-margin-and-isolated-margin-market_data).

Added CountdownCancelAll to [Auto-Cancel All Open Orders](https://binance-docs.github.io/apidocs/futures/en/#auto-cancel-all-open-orders-trade)