Send set cursor events whenever there is mouse movement

This is required in order to allow application code to change the cursor
dynamically.

Closes https://github.com/wxWidgets/wxWidgets/pull/1549

include/wx/qt/window.h

@@ -168,6 +168,7 @@ public:
 
     static void QtStoreWindowPointer( QWidget *widget, const wxWindowQt *window );
     static wxWindowQt *QtRetrieveWindowPointer( const QWidget *widget );
+    static void QtSendSetCursorEvent(wxWindowQt* win, wxPoint posClient);
 
 #if wxUSE_ACCEL
     virtual void QtHandleShortcut ( int command );