[bisq-network/bisq] Refactor option handling (#3889)

[Chris Beams]

I've just pushed fixes for the code quality issues, but a number of false positives will remain unfixed. Please see my commit comment for details. @ripcurlx, this may be an example of a PMD rule we want to eliminate. Would like to know why it's a false positive, though. Those imports are in fact used.

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