groff(1): Revise.

The output device/output driver/postprocessor discussion was a mess with
many redundancies; clean it up.

* Use "output device", "output driver", and "postprocessor" terminology
  much more strictly; moreover, define all of these terms.
* Say "GNU roff" when referring to the project/distribution to avoid
  confusion with the program being documented in this page.
* Underline definitional appearances of terms more consistently,
  including "macro package" and "intermediate output".
* Motivate utility of nroff wrapper.
* (Output devices, Postprocessors, Utilities): Reorganize and rewrite.

* Convert reference to installed copy of mom(7)'s HTML documentation
  into a file:// URI.
* Break text lines after (prose) commas, colons, and semicolons.
* Shovel more dirt onto the term "classical" as applied to other *roff
  implementations.
* Tighten wording.

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