Add ways to substitute strtof/strtod/strtold with custom functions #329
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The standard strtof/strtod/strtold are by default locale-aware. There are a number of situations where we'd rather want to be able to use locale-independent parsing functions. This can be done by setting the ARGPARSE_CUSTOM_STRTOF/ARGPARSE_CUSTOM_STRTOD/ARGPARSE_CUSTOM_STRTOLD macros to the appropriate value.
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The standard strtof/strtod/strtold are by default locale-aware. There are a number of situations where we'd rather want to be able to use locale-independent parsing functions. This can be done by setting the ARGPARSE_CUSTOM_STRTOF/ARGPARSE_CUSTOM_STRTOD/ARGPARSE_CUSTOM_STRTOLD macros to the appropriate value.