Unicode support for wxString (wxchar.cpp won't compile without it, so I
figured I couldn't hold it back anyway). Added many macros. Changed most char to wxChar, and literals wrapped in _T(). Added conversion classes. Added new constructors to wxString, and mb_str(), wc_str(), and fn_str() (the last is mb_str() on Unix and c_str() on Windows, since Windows takes file names in Unicode (I think), while Unix doesn't). Rewrote wxString::Printf(). git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2109 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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