This change supports creation of BSQ BLOCKCHAIN payment method accounts.

- Added proto message defs to grpc.proto.
- Added grpc server boilerplate to GrpcPaymentAccountsService.
- Added server impl to CoreApi, CorePaymentAccountsService.
- Added createcryptopaymentacct-help.txt.
- Added CLI side support for new api method.
- Added opt parsing unit tests to OptionParsersTest.

This is the 1st PR in a series, with the goal of supporting the BTC/BSQ trading
pair.  Support for other crypto currency payment accounts will be added later.

This change adds offer and trade contract detail to the API's Offer
and Trade protos, and improves CLI output formatting.

- Appended missing fields to OfferInfo proto message:
	uint64 sellerSecurityDeposit = 20;
	string offerFeePaymentTxId = 21;
	uint64 txFee = 22;
	uint64 makerFee = 23;

- Added new api proto messages ContractInfo and PaymentAccountPayloadInfo.
  Lighterweight protos are needed because core Trade/Contract classes are
  not visible to CLI.

- Appended ContractInfo field to api proto message TradeInfo.

- Added proto / model converters for ContractInfo and PaymentAccountPayloadInfo,
  and adjusted OfferInfo & TradeInfo.

- Improved CLI output formatting.  Added more trade detail to CLI's gettrade output,
  and prepared to support BTC/BSQ trading pair.  Note a reviewer is advised to
  look at the CLI outout formatting class files instead getting bogged down in the
  many commit changes.

The number of gettrade output columns are the same for makers and takers.

- Added bool tradeInstant field to proto message def.
- Adjusted core createcryptopaymentacct impl to new tradeInstant request param.
- Adjusted cli side createcryptopaymentacct impl to new tradeInstant request param.
- Fixed CliMain's takeoffer help text (was missing the --payment-account opt).

…ontract-details

- Added AvailabilityResultWithDescription proto for better takeoffer failure msgs.
- Added VerifyBsqSentToAddress impl to api, but don't expose to CLI yet.
- Show BSQ Buyer Address in gettrade output (changed cli output formatting classes).
- Fixed api.model.PaymentAccountPayloadInfo altcoin instant acct support bug