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Hi Poppler crew,

In this request:

• the first two commits refactor poppler/SplashOutputDev to enable code sharing with the proposed new output device, and expose a couple interfaces in splash as public.
• the third commit adds the new code for utils/plotler, the utility that adds the new stroke-output mode.

Things I know need attention:

• The third commit adds some PDFs that I test (manually) with. They don't go here. Can I get guidance on where they belong?
• See Plot.h:136 for a comment/review request about a new matrix type.
• There are no tests introduced. I'd like guidance on what would be appropriate here. Unit tests? How do you do stable end-to-end tests for graphical output?

Thanks for your advice!