Lualatex and emojis#363
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pehrsoderman
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This PR replaces pdflatex with lualatex for PDF rendering. It also loads fonts suitable for greek, cyrillic, and emojis if available on the system. If anyone has more experience trying to write portable font loading in LaTeX, please let me know. It would also be nice to support more languages, like chinese, japanese, and korean (and preferably in a way that does not blow up the size of our dependencies).
Note that PDF rendering will end up a bit different with lualatex compared to pdflatex. I think I preferred the old rendering, but I'm very unsure what to tweak to get us closer to that. Again, contributions are very welcome.
This PR also removes support for sample I/O in iso8859-1.
Fixes #179
Fixes #341