* Config: v5 Split GateIO futures into CoinM and USDT
* GateIO: Split asset.Futures into CoinM and USDT
* Fix CancelBatchOrders using wrong endpoint for CoinMarginedFutures
* Fix TestGetActiveOrders expecting currency.ErrCurrencyPairsEmpty
* Config: Add config version continuity step to CI
* GateIO: Pin CoinM futures to just BTC/USD
Right now we only have a /btc endpoint available, and only BTCUSD is
available.
If GateIO offers more, we'll need to add a settlement currencies list
again
