vg/vgpdf: support for non-ASCII text
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enhancement
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Description
this is a follow-up of gonum/plot#208.
currently, `vg/vgpdf` uses a PDF backend that doesn't support non-ASCII text.
either:
- contribute support to upstream (`bitbucket.org/zombiezen/gopdf/pdf`).
this project is in maintainance mode, quite dormant.
- switch to `github.com/llcode/draw2d/draw2dpdf`.
this project (or its sibling, `draw2d/draw2dimg`) record wrt backward compatibility and API stability is somewhat checkered.
- switch to `github.com/jung-kurt/gofpdf`.
(just listing options at this point)
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