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/bitmap.h

@@ -133,9 +133,6 @@ public:
     static void InitStandardHandlers();
     */
 
-    virtual bool Ok() const { return IsOk(); }
-    virtual bool IsOk() const = 0;
-
     virtual int GetHeight() const = 0;
     virtual int GetWidth() const = 0;
     virtual int GetDepth() const = 0;