Globally replace _T() with wxT().

Standardize on using a single macro across all wxWidgets sources and solve the name clash with Sun CC standard headers (see #10660).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61508 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/splitter.h

@@ -91,7 +91,7 @@ public:
     void SetSplitMode(int mode)
     {
         wxASSERT_MSG( mode == wxSPLIT_VERTICAL || mode == wxSPLIT_HORIZONTAL,
-                      _T("invalid split mode") );
+                      wxT("invalid split mode") );
 
         m_splitMode = (wxSplitMode)mode;
     }