Have a working implementation of NFT trading in Cashtab now with D16328
Requires a number of new and more complicated transactions. To properly support these transactions, some improvements are required in how transaction inputs and outputs are prepared.
This change improves code readability and ensures consistency with the handling of token dust change outputs, i.e. a targetOutput created by Cashtab as a token UTXO intended to be received by the same wallet that broadcasts the transaction.