gateio/kucoin: assortment of fixes (#1404)

* gateio: fix unmarshal bug and update fields

* gateio: fix wrapper function function, add helper methods

* update order types and add kucoin wrapper fix

* currency pairs

* Add tests

* gateio; inspect error and continue for no funds in account, kucoin: fetch all settlement amounts

* futures: order fixit

* finish off gateio updates for market orders

* cute line

* Update exchanges/kucoin/kucoin_wrapper.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/kucoin/kucoin_wrapper.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/gateio/gateio.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/gateio/gateio_wrapper.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* Update exchanges/gateio/gateio_wrapper.go

Co-authored-by: Scott <gloriousCode@users.noreply.github.com>

* glorious: nits

* glorious: nits - filter by pair match and fix bug where the endpoint returns details instead of message

* Add fix for leverage check (non-merge) my ip has been blocked from gateio still... scammmmmmmm

* glorious: nitters

* Update exchanges/gateio/gateio_test.go

Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

* Update exchanges/gateio/gateio_test.go

Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

* Update exchanges/gateio/gateio_test.go

Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

---------

Co-authored-by: Ryan O'Hara-Reid <ryan.oharareid@thrasher.io>
Co-authored-by: Scott <gloriousCode@users.noreply.github.com>
Co-authored-by: Adrian Gallagher <adrian.gallagher@thrasher.io>

cmd/exchange_wrapper_standards/exchange_wrapper_standards_test.go

@@ -244,6 +244,11 @@ func CallExchangeMethod(t *testing.T, methodToCall reflect.Value, methodValues [
 		if isUnacceptableError(t, err) != nil {
 			literalInputs := make([]interface{}, len(methodValues))
 			for j := range methodValues {
+				if methodValues[j].Kind() == reflect.Ptr {
+					// dereference pointers just to add a bit more clarity
+					literalInputs[j] = methodValues[j].Elem().Interface()
+					continue
+				}
 				literalInputs[j] = methodValues[j].Interface()
 			}
 			t.Errorf("%v Func '%v' Error: '%v'. Inputs: %v.", exch.GetName(), methodName, err, literalInputs)
@@ -448,6 +453,7 @@ func generateMethodArg(ctx context.Context, t *testing.T, argGenerator *MethodAr
 			ClientID:          "1337",
 			ClientOrderID:     "13371337",
 			ImmediateOrCancel: true,
+			Leverage:          1,
 		})
 	case argGenerator.MethodInputType.AssignableTo(orderModifyParam):
 		input = reflect.ValueOf(&order.Modify{