[bisq-network/proposals] Proposal to increase liquidity on Bisq by allowing each offer to have multiple payment methods and currencies associated with it. (#288)

[sqrrm]

I like the idea of allowing more than one account per offer. As @Bisq-knight mentions, the only real method to do this would be to modify the offer protocol. The mock ups are not simple but would work for power users. For casual users I suspect it would lead to more confusion with so many options to deal with while creating an offer. Some thoughts I have on how this could be done:
- Accounts could have a default flag, these accounts will be included in the offer as potential transaction accounts for the trade.
- Offers add the default accounts while created. This includes all the currencies for these accounts, but with an option to configure more specifically as suggested in the mock ups.
- The offerbook shows the offer for all filters it fits.
- Signed account status is per account so the offer size is limited by the lowest account setting, could either fail to create offers if not all accounts are valid for the size, or exclude accounts that don't allow the size as long as some account(s) do.
- Adding this on top of the current offer protocol could work by adding a new repeated account field to OfferPayload and using the first of those OfferPayloads as the data for the current message. Old clients would see only one possible account/market but new clients could parse the repeated field which would allow to trade with all those accounts.

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