[wip][testers needed][charconv] replace atof and atoi with from_chars

Закрыто xottab-duty запросил слияние github/fork/ZeeWanderer/cpp17 в xd_dev

Created by: ZeeWanderer

  • src
    • atof replaced
    • atoi replaced

Notes:

  • xrUICore, xrSE_Factory, ctool and tinyxml were ignored.
  • xr_ini has some error handling for from_chars due to difference from atoi in treating invalid input, the performance cost is negligible.