Barcode128 pattern compute class: A class which computes barcode128 pattern

The class can compute the bar codes according to bar code 128 standard.

It takes a given string of characters and computes the respective bar code pattern and check digit pattern using either code set A or B.

The class may return an array with the list of patterns or output the array as the current script output.

It can also compute the width for the encoded string pattern given the width of each character.