[lmi] Doxygen: BUILTIN_STL_SUPPORT

[Greg Chicares]

With doxygen-1.9.4, there's an option that isn't mentioned
in wx's 'docs/doxygen/Doxyfile' of doxygen-1.8.8 vintage:

  # If you use STL classes (i.e. std::string, std::vector, etc.) but do not want
  # to include (a tag file for) the STL sources as input, then you should set 
this
  # tag to YES in order to let doxygen match functions declarations and
  # definitions whose arguments contain STL classes (e.g. func(std::string);
  # versus func(std::string) {}). This also make the inheritance and 
collaboration
  # diagrams that involve STL classes more complete and accurate.
  # The default value is: NO.

  BUILTIN_STL_SUPPORT    = YES

Perhaps it might be beneficial for wx to use it when STL
becomes the default; or maybe it's too noisy. The effect
of toggling it to "YES" is evident in the "collaboration
diagram for lmi class yare_input:

 - with "NO", only members of type calendar_date are shown;

 - with "Yes", members of type string and of particular
   vector<whatever> types are also shown.