Add new plotters

[ithinkido]

Description

Add the following HPGL plotter configs - HP7550, Roland DXY 1xxx and Sketchmate.

Checklist

• feature/fix implemented
• code formatting ok (black and isort)
• mypy returns no error
• tests added/updated and pytest succeeds
• documentation added/updated
  • command docstring and option/argument help
  • README.md updated (Feature Overview)
  • [ x ] CHANGELOG.md updated
  • added new command to reference.rst
  • RTD doc updated and building with no error (make clean && make html in docs/)

[codecov]

Codecov Report

Merging #474 (ec75633) into master (faad5b2) will not change coverage.
The diff coverage is n/a.

❗ Current head ec75633 differs from pull request most recent head df21281. Consider uploading reports for the commit df21281 to get more accurate results

@@           Coverage Diff           @@
##           master     #474   +/-   ##
=======================================
  Coverage   94.38%   94.38%           
=======================================
  Files          60       60           
  Lines        5396     5396           
  Branches      786      786           
=======================================
  Hits         5093     5093           
  Misses        185      185           
  Partials      118      118           

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[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[abey79]

Thanks!