Wide String Shims for std::exception

The latest release of STLSoft (1.9.102) includes wide string additions to the string access shims for std::exception (and derived types). The most obvious and immediate benefit is that code using FastFormat and/or Pantheios in wide string builds can now work seamlessly with exceptions, just as has always been the case in multibyte string builds:

#include <fastformat/ff.hpp>

. . .

#include <pantheios/pan.hpp>

. . . 

int main()

{

. . .

  catch(std::exception& x)

  {

    pan::log_CRITICAL(L"exception: ", x);

    ff::fmtln(std::wcerr, L"program: {0}", x);

  }

. . .