Add wxFileType::GetExpandedCommand()

This new method allows to get the command expanded with the given file name
for commands other than "Open" and "Print".

Closes #17367.

include/wx/osx/core/mimetype.h

@@ -105,6 +105,9 @@ public:
     bool SetDefaultIcon(const wxString& strIcon = wxEmptyString, int index = 0);
     bool Unassociate(wxFileType *ft);
 
+    wxString
+    GetExpandedCommand(const wxString& verb,
+                       const wxFileType::MessageParameters& params) const;
 private:
 
     // All that is needed to query type info - UTI and pointer to the manager