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It happens to work without strings.h on glibc or with _GNU_SOURCE, but
the POSIX standard requires including <strings.h>.
Hopefully fixes OSX build.
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Something like "char *s = ...; isdigit(s[0]);" triggers undefined
behavior, because char can be signed, and thus s[0] can be a negative
value. The is*() functions require unsigned char _or_ EOF. EOF is a
special value outside of unsigned char range, thus the argument to the
is*() functions can't be a char.
This undefined behavior can actually trigger crashes if the
implementation of these functions e.g. uses lookup tables, which are
then indexed with out-of-range values.
Replace all <ctype.h> uses with our own custom mp_is*() functions added
with misc/ctype.h. As a bonus, these functions are locale-independent.
(Although currently, we _require_ C locale for other reasons.)
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We're being a little bit lazy here and limit the max allocation to
SIZE_MAX/2, which is practically infinite anyway on 64 bit systems.
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Drop usage of the ugly PUT_UTF8() macro.
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Apparently this can be really useful when being paranoid and trying to
avoid too much malloc/realloc, since it can be used to appending into a
buffer (with transparent realloc only if the buffer is too small).
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