Fee could be underestimated if input address type != output address type

[sander2]

Right now, the code assumes that the output address is of the same type as the input address. Since the fee estimation is used to determine the maximum amount we can send, we need to be as pessimistic as possible. Meaning, we should assume by default that the output address is of the type that is most expensive to send funds to. And it'd be good if this type could be overwritten by the function parameters.