Implements an Affine cipher algorithm (a special case of a Substitution Cipher that
encrypts and decrypts a character based on two Affine functions) for any of three alphabet
ranges including az, AZ, az+AZ.
Creates an AffineEngine and sets the alphabetRangeOptions instance variable
to "110000", which translates to the "az+AZ"alphabet option for both the
plaintext and ciphertext alphabets.