rule parser: don't use uninitialized value
Convert ParseSizeString to use pcre_copy_substring
Convert flow keyword parsing to use pcre_copy_substring
Convert flowbits keyword parsing to use pcre_copy_substring
detect: use macro for max rule size
rule parser: convert to use pcre_copy_string
Convert pcre keyword parsing to use pcre_copy_substring
Convert dsize keyword parsing to use pcre_copy_substring