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4c5ceb040cwallet: CreateTransaction(): return out-params as (optional) struct (Sebastian Falbesoner)c9fdaa5e3awallet: CreateTransactionInternal(): return out-params as (optional) struct (Sebastian Falbesoner) Pull request description: The method `CWallet::CreateTransaction` currently returns several values in the form of out-parameters: * the actual newly created transaction (`CTransactionRef& tx`) * its required fee (`CAmount& nFeeRate`) * the position of the change output (`int& nChangePosInOut`) -- as the name suggests, this is both an in- and out-param By returning these values in an optional structure (which returns no value a.k.a. `std::nullopt` if an error occured), the interfaces is shorter, cleaner (requested change position is now in-param and can be passed by value) and callers don't have to create dummy variables for results that they are not interested in. Note that the names of the replaced out-variables were kept in `CreateTransactionInternal` to keep the diff minimal. Also, the fee calculation data (`FeeCalculation& fee_calc_out`) would be another candidate to put into the structure, but `FeeCalculation` is currently an opaque data type in the wallet interface and I think it should stay that way. As a potential follow-up, I think it would make sense to also do the same refactoring for `CWallet::FundTransaction`, which has a very similar parameter structure. Suggested by laanwj in https://github.com/bitcoin/bitcoin/pull/20588#issuecomment-739838428. ACKs for top commit: achow101: re-ACK4c5ceb040cXekyo: ACK4c5ceb040cw0xlt: crACK4c5ceb040cTree-SHA512: 27e5348bbf4f698713002d40c834dcda59c711c93207113e14522fc6d9ae7f4d8edf1ef6d214c5dd62bb52943d342878960ca333728828bf39b645a27d55d524