[bisq-network/bisq] Privacy improvements for manual payout (#4899)

[chimp1984]

> > E.g. If we make it a bit more automated then the users could use that tool to make an alternative payout with arbitrary outputs and fees so it can serve both the idea to boost stuck tx chains by CPFP and to be used as emergency tool if normal payout options do not work. Of course adding too much complexity to an emergency tool is not a good idea...
> 
> @chimp1984 Its a good idea and I'd like to take some time to think about a UI design for it.

Actually after more thought, I found that it might be ok to do it manually. It is exceptional anyway and the manual process via mediator brings some safety. Otherwise there might be risky situations (e.g. buyer sending signature but then later it gets confirmed and he starts the payment, but seller takes signature and gets back his trade amount with it...). I started a while back a "cancel trade" sub-protocol" and it turned out that its more tricky and risky as it seems first. Mainly because it introduces a parallel execution stream and that can cause problems.

So if your tool supports to change the miner fee, it would fulfill the basic requirements for a CPFP. The calculation how much fee is required can also be done manually by a explorer look up. I think its not worth the effort for that edge case.... Just would be good that we have a tool at hand to un-block stuck txs in times when the fees spike and sustain high.  

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