Added wxTLW::SetShape and implementations for wxGTK, wxMSW and an

empty stub for wxMac.
Added some generic helpers and a new ctor to wxRegion.
Added samples/shaped.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19857 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk1/toplevel.h

@@ -60,6 +60,8 @@ public:
     virtual bool ShowFullScreen(bool show, long style = wxFULLSCREEN_ALL);
     virtual bool IsFullScreen() const { return m_fsIsShowing; };
 
+    virtual bool SetShape(const wxRegion& region);
+
     virtual bool Show(bool show = TRUE);
 
     virtual void SetTitle( const wxString &title );