[libc] Add thousands grouping to printf #2014
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Adds the ability to display large numbers using comma-based thousands separator, e.g.
%,luto display up to 4 billion and more easily read it. Also supports ' and _ instead of , by specifying the same. This code could be used to enhancedfor mount displays showing filesystem sizes with more readability.Eliminated some unused code in vfprintf,
#hash flag specifier previously only used for octal display.Added documentation on supported format types and flag specifiers at top of libc/stdio/vfprintf.c.
Temporarily using test code in cat.c, to be removed shortly.