Merge wxQT branch into the trunk.

This merges in the latest sources from GSoC 2014 wxQt project with just a few
minor corrections, mostly undoing wrong changes to common files in that branch
(results of a previous bad merge?) and getting rid of whitespace-only changes.
Also remove debug logging from wxGrid.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77455 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/qt/defs.h

@@ -0,0 +1,17 @@
+/*
+ *  Name:        wx/qt/defs.h
+ *  Author:      Peter Most
+ *  Copyright:   (c) Peter Most
+ *  Licence:     wxWindows licence
+ */
+
+#ifndef _WX_QT_DEFS_H_
+#define _WX_QT_DEFS_H_
+
+#ifdef __cplusplus
+
+typedef class QWidget *WXWidget;
+
+#endif 
+
+#endif /* _WX_QT_DEFS_H_ */