We often used a pattern like if (!FLAGS_SET(flags, SD_JSON_FORMAT_OFF)), which is rather verbose and also contains a double negative, which we try to avoid. Add a little helper to avoid an explicit bit check. This change clarifies an aditional thing: in some cases we treated SD_JSON_FORMAT_OFF as a flag (flags & SD_JSON_FORMAT_OFF), while in other cases we treated it as an independent enum value (flags == SD_JSON_FORMAT_OFF). In the first form, flags like SD_JSON_FORMAT_SSE do _not_ turn the json output on, while in the second form they do. Let's use the first form everywhere. No functional change intended. Initially I wasn't sure if this helper should be made public or just internal, but it seems such a common pattern that if we expose the flags, we might just as well expose it too, to make life easier for any consumers.
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