Changing datatransfer implementation from CFPasteboard to NSPasteboard API (#1264)

* changing datatransfer from CFPasteboard to NSPasteboard API

* factoring and cleaning up

* Switching back naming

* missed file

* getting wxCFStringRef to be independent of system headers

* add unichar include

* using wxCFStringRef in header

* moving to private headers, change method name

* adapting to lesser content in cfstring.h

* Removing malloc/free usage

* use wxScopedArray throughout

* using wxMemoryBuffer instead of char[]

* fixing nonprecomp headers

* missing forward decl in non-precomp builds

src/osx/fswatcher_fsevents.cpp

@@ -19,6 +19,8 @@
 
 #include "wx/fswatcher.h"
 #include "wx/osx/core/cfstring.h"
+#include "wx/osx/core/private/strconv_cf.h"
+
 #include <CoreFoundation/CoreFoundation.h>
 
 // A small class that we will give the FSEvents