branch dev/tools: get updated unprint and parse-escp2 files

[dpk9]

most recent seem to be in gimp-print/gimp-print/test

[rick3rt]

I by chance saw this issue, most recent versions can be found in the original gutenprint source: https://sourceforge.net/p/gimp-print/source/ci/master/tree/test/

[dpk9]

thanks for the tip