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.
(Backport to 2.4 from 2.5)


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_4_BRANCH@19872 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/toplevel.h

@@ -58,6 +58,8 @@ public:
     virtual void SetIcons(const wxIconBundle& icons );
     virtual void Restore();
 
+    virtual bool SetShape(const wxRegion& region);
+
     virtual bool Show(bool show = TRUE);
 
     virtual bool ShowFullScreen(bool show, long style = wxFULLSCREEN_ALL);