[bisq-network/bisq-desktop] Add payment method: moneygram (#1050)

[Bernard Labno]

@ManfredKarrer I've added following changes:
- renamed `MTCN` to `Authorisation #`
- MoneyGramPaymentAccount does not extend CountryBasedPaymentAccount any more

With those changes, I was able to complete regtest trade with accounts from 2 different countries.
Only payment method and currency are now required to be the same.

I'll apply those changes to WU in a separate request.

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