Deprecate wxPropertyGrid::DoubleToString().

Simply use wxNumberFormatter instead, this reduces code duplication and avoids
bugs due to formatting inconsistencies in DoubleToString().

Closes #15625.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75561 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgrid.h

@@ -1568,6 +1568,7 @@ public:
                            wxRect& rect,
                            int flags );
 
+#if WXWIN_COMPATIBILITY_3_0
     /** Standardized double-to-string conversion.
     */
     static const wxString& DoubleToString( wxString& target,
@@ -1575,6 +1576,7 @@ public:
                                            int precision,
                                            bool removeZeroes,
                                            wxString* precTemplate = NULL );
+#endif // WXWIN_COMPATIBILITY_3_0
 
     /**
         Call this from wxPGProperty::OnEvent() to cause property value to be