message: Improve error message and use check_exit() instead of check_throw()
diff: @@ -86,7 +86,7 @@ namespace vcpkg::Commands::Import
  const fs::path project_directory(args.command_arguments[2]);
  auto pghs = Paragraphs::get_paragraphs(control_file_path);
  - Checks::check_throw(pghs.size() == 1, "Invalid control file for package");
  + Checks::check_exit(pghs.size() == 1, "Invalid control file %s for package", control_file_path.generic_string());
  StatusParagraph spgh;
  spgh.package = BinaryParagraph(pghs[0]);
  