add IsOk() to all classes having Ok() method (patch 1570985)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@41751 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/font.h

@@ -157,7 +157,8 @@ public:
     static wxFont *New(const wxString& strNativeFontDesc);
 
     // was the font successfully created?
-    bool Ok() const { return m_refData != NULL; }
+    bool Ok() const { return IsOk(); }
+    bool IsOk() const { return m_refData != NULL; }
 
     // comparison
     bool operator == (const wxFont& font) const;