Fix Ok/IsOk() mess in wxGDIObject-derived classes; also added

wxGDIObject::Create/CloneGDIRefData() and implemented them for (almost) all
ports


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@50727 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/palette.h

@@ -25,8 +25,6 @@ class WXDLLEXPORT wxPaletteBase: public wxGDIObject
 public:
     virtual ~wxPaletteBase() { }
 
-    virtual bool Ok() const { return IsOk(); }
-    virtual bool IsOk() const = 0;
     virtual int GetColoursCount() const { wxFAIL_MSG( _T("not implemented") ); return 0; }
 };