Support local format for numeric fields

[noyainrain]

Parse numeric fields according to the configured locale, respecting the decimal and grouping separator.

[noyainrain]

Draft

[flatdir]
# Locale of the directory
locale = C

class Directory:
    """Numbers are parsed and :attr:`currency` is determined according to the current locale."""

    # Future reference
    """Sign of the currency in use."""
    currency: str