* configure max chars for textbox * min 1 * Adds server-side check for text box min and max character validation. * Applied suggestion from code review. * Bumped version of test helper * Fixed test that was creating a text string data type with too large a maximum characters setting. --------- Co-authored-by: Andy Butland <abutland73@gmail.com> Co-authored-by: Nhu Dinh <hnd@umbraco.dk>