GUID/UUID generator suggestions

[Gintaras]

Because FromGUID is a str member function, it can be called either from another str member function or with a str variable like
Macro Macro2818

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GUID g
int r=CoCreateGuid(&g)
str s.FromGUID(g)
out s

it is the same as
Macro Macro2818

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str s.Guid
out s