first phase of transition to unified Unicode build:

1. changed c_str() to return wxCStrData (implicitly convertible to wxChar*)
2. added template type-safe wrappers for vararg functions
3. added wxUniChar class representing single Unicode character
4. changed wxString::operator[] and wxString::iterator to return wxUniChar


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@44865 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/streams/sstream.cpp

@@ -74,7 +74,7 @@ strStream::strStream()
     m_str.reserve(LEN);
     for ( size_t n = 0; n < LEN; n++ )
     {
-        m_str += _T('A') + n % (_T('Z') - _T('A') + 1);
+        m_str += wxChar(_T('A') + n % (_T('Z') - _T('A') + 1));
     }
 }