Add raw option to DataMatrix

[UberKitten]

I need to generate a DataMatrix barcode with special control codes and C40 encoding, at least until #41 is added. 😃 This is for programming Symbol barcode scanners, which seem to require both to accept the barcode as a programming barcode.

It's easy enough to generate the raw codes for C40, but the parse option mangles the output converting to ASCII. This seems to be solved with the raw option for other symbologies.

Ideally I would like to have the following:
Bar text: ^234^230^170^054^129
Options: raw

Output would decode to: {Reader programming}{C40 start}N59{End of message}

[terryburton]

Added with e5adc6d.

Pseudo random padding is added automatically so you could use ^234^230^170^054 in place of your example above.

[terryburton]

Tagged 2018-08-27 and released here: https://github.com/bwipp/postscriptbarcode/releases/tag/2018-07-27.

Hi @metafloor: @T3hUb3rK1tten is presenting at Def Con 26 and might appreciate if BWIP-JS could synced with the just-released BWIPP.

https://www.defcon.org/html/defcon-26/dc-26-speakers.html#West
https://barcowned.com/app/

@T3hUb3rK1tten May the demo gods be with you :-)