1.16 (15-Aug-2022) - Changes to load the "l4d_mutants.cfg" data config based on the z_difficulty value if the file exists. - Valid filenames are "l4d_mutants_easy.cfg", "l4d_mutants_normal.cfg", "l4d_mutants_hard.cfg" and "l4d_mutants_impossible.cfg". - Requested by "Hawkins".