• -masterdatadir for datadir bootstrapping #13746 (-masterdatadir for datadir bootstrapping by kallewoof)
• PSBT key path cleanups #13723 (PSBT key path cleanups by sipa)
• bitcoin-cli: -stdinwalletpassphrase and non-echo stdin passwords #13716 (bitcoin-cli: -stdinwalletpassphrase and non-echo stdin passwords by kallewoof)
• Remove the boost/algorithm/string/case_conv.hpp dependency #13671 (Remove the boost/algorithm/string/case_conv.hpp dependency by 251Labs)
• wallet: Fix backupwallet for multiwallets #13667 (wallet: Fix backupwallet for multiwallets by domob1812)
• Check for datadir after the config files were read #13621 (Check for datadir after the config files were read by Flowdalic)
• Make objects in range declarations immutable by default. Avoid unnecessary copying of objects in range declarations. #13249 (Make objects in range declarations immutable by default. Avoid unnecessary copying of objects in range declarations. by practicalswift)
• gui: Add dynamic wallets support  #13100 (gui: Add dynamic wallets support by promag)
• Log early messages with -printtoconsole #13088 (Log early messages with -printtoconsole by ajtowns)
• macOS: disable AppNap during sync #12783 (macOS: Disable AppNap by krab)
• Free BerkeleyEnvironment instances when not in use #11911 (Free CDBEnv instances when not in use by ryanofsky)
• Add BitcoinApplication & RPCConsole tests #11625 (WIP: Add BitcoinApplication & RPCConsole tests by ryanofsky)
• Add fee_est tool for debugging fee estimation code #10443 (Add fee_est tool for debugging fee estimation code by ryanofsky)

If you consider this pull request important, please also help to review the conflicting pull requests. Ideally, start with the one that should be merged first.

Can be don with #13426