?: string A string of characters to map to every sprite in the characters grid
default " !\"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz{|}~";
?: TexFilter Rasterization filter to use, if different than the global font filter.