feature(render): adds encapsulated postscript (eps) output format

[sverweij]

Description, Motivation and Context

See title; another attempt to produce something LaTeX build pipelines can ingest (see #129)

This PR is also published on npm as a beta: [email protected]

How Has This Been Tested?

• automated non-regression tests + green ci
• additional unit tests for .eps

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Documentation only change
• Refactor (non-breaking change which fixes an issue without changing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• 📖

  • My change doesn't require a documentation update, or ...
  • it does and I have updated it

• ⚖️

  • The contribution will be subject to The MIT license, and I'm OK with that.
  • The contribution is my own original work.
  • I am ok with the stuff in CONTRIBUTING.md.

[codeclimate]

The PR diff size of 20218 lines exceeds the maximum allowed for the inline comments feature.

[codeclimate]

Code Climate has analyzed commit cfae21e and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (100% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

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