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
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@19688 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775