- use strstrip() to remove leading and trailing whitespace
- use _nm_utils_ascii_str_to_int64() for parsing numeric values
like 0 and 1. The difference is small, for one, it also accepts
hex numbers like 0x1. More interestingly, it uses our common
number parsing function, and we will later do the same for
parsing ternaries.
g_set_error(error, 1, 0, ...) is not right. "1" is not a valid GQuark,
we should initialize proper error instances.
Use nm_utils_error_set() for that.
Also, the code previously hacked the numeric value "1" to indicate
ambiguous text. Add and use a new error code NM_UTILS_ERROR_AMBIGUOUS
for that.
With a const argument, we can make variables static const,
which means the linker loads the memory as read only.
Also, use NM_CAST_STRV_CC() macro, which casts the argument
accordingly.
