made internal members of wxColourData public again; added a comment warning users to not use them directly

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55841 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/cmndata.h

@@ -55,7 +55,9 @@ public:
     wxString ToString() const;
     bool FromString(const wxString& str);
 
-private:
+
+    // public for backwards compatibility only: don't use directly
+public:
     wxColour        m_dataColour;
     wxColour        m_custColours[NUM_CUSTOM];
     bool            m_chooseFull;