SignStdTx appends a signature to a StdTx and returns a copy of a it. If appendSig is false, it replaces the signatures already attached with the new signature. Don't perform online validation or lookups if offline is true.
(txBldr authtxb.TxBuilder, cliCtx context.CLIContext, name string, stdTx auth.StdTx, appendSig bool, offline bool)
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