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

[Chris Beams]

I've just rebased this PR branch against current `master` which includes the merge for #3888.

@ripcurlx, your NACK has been addressed in #3888, which as mentioned above is now merged. Please re-review and ACK if you see fit. No substantive changes have been made; only those that were necessary to eliminate conflicts resulting from the rebase.

@sqrrm you should be good to go to review this now.

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