[LyX/master] Clarify debug message

[Thibaut Cuvelier]

On Sun, 27 Feb 2022 at 15:16, Jürgen Spitzmüller <spitz at lyx.org> wrote:

> Thibaut, you might want to introduce a Debug::DOCBOOK mode rather than
> sending these messages over all channels (also, in other cases, the
> docbook chain uses Debug::LATEX which strikes me odd).
>

I'm doing this in the attached patches (also for HTML, XML being the common
part between the two). I would like some feedback more specifically for the
typing of the enum: as I could find, it's never sure that enums are coded
with enough bits to add a code (there are already enough codes to fill 32
bits). I thus forced the types to be unsigned long long, to have 64
available bits (https://en.cppreference.com/w/cpp/language/types).

I also tried to change as many occurrences I could find, but there were not
many (or my searching skills are not on par).
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