- update the implementation of ParserHelper from locale-based std::to_string, std::stod, std::stoull, to locale-independent function std::from_chars and std::to_chars. - rename TerminalHelper to ConsoleHelper.
- basically finish parser helper, including TryParse, Parse and ToString. - only Parse has been tested. other test should be filled in future.
- finish FileFilters class representing the file types area in popup dialog.
