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92326d8976[rpc] add send method (Sjors Provoost)2c2a1445dc[rpc] add snake case aliases for transaction methods (Sjors Provoost)1bc8d0fd59[rpc] walletcreatefundedpsbt: allow inputs to be null (Sjors Provoost) Pull request description: `walletcreatefundedpsbt` has some interesting features that `sendtoaddress` and `sendmany` don't have: * manual coin selection * outputting a PSBT (it was controversial to add this, see #18201) * create a transaction without adding to wallet (which leads to broadcasting, unless `-walletbroadcast=0`) At the same time `walletcreatefundedpsbt` can't broadcast a transaction, which is inconvenient for simple use cases. This PR introduces a new `send` RPC method which creates a PSBT, signs it if possible and adds it to the wallet by default. If it can't sign all inputs, it outputs a PSBT. If `add_to_wallet` is set to `false` it will return the transaction in both PSBT and hex format. Because it uses a PSBT internally, it will much easier to add hardware wallet support to this method (see #16546). For `bitcoin-cli` users, it tries to keep the simplest use case easy to use: ```sh bitcoin-cli -regtest send '{"ADDRESS": 0.1}' 1 sat/b ``` This paves the way for deprecating `sendtoaddress` and `sendmany` though there's no rush. The only missing feature compared to these older methods is adding labels to a destination address. Depends on: - [x] #16377 (`[rpc] don't automatically append inputs in walletcreatefundedpsbt`) - [x] #11413 (`[wallet] [rpc] sendtoaddress/sendmany: Add explicit feerate option`) - [x] #18244 (`[rpc] have lockUnspents also lock manually selected coins`) ACKs for top commit: meshcollider: Light re-utACK92326d8976achow101: ACK92326d8976Reviewed code and test, ran tests. kallewoof: utACK92326d8976Tree-SHA512: 7552ef1b193d4c06e381c44932fdb0d54f64383e4c7d6b988f49d059c7d4bba45ce6aa7813e03df86360ad9dad6f3010eb76ee7da480551742d5fd98c2251c0f