Consider adding scriptWitness to CTxIn #70
Description
Since Core now got rid of CTxWitness in bitcoin/bitcoin#8589, it might make sense to at least provide a 'compatible' accessor to be able refer to tx.wit.vtxwinwit[i].scriptWitness via tx.vin[i].scriptWitness.
But we need to retain CTxWitness and old way of tx.wit.... to not break any existing code