OpenGrok for core

[Noel Grandin]

Note that the new opengrok does not seem to work very well on chrome (Version
71.0.3578.98 (Official Build) (64-bit))

specifically, pages like

https://opengrok.libreoffice.org/xref/core/include/vcl/vclptr.hxx?r=2e83a62f
do not show a scrollbar, so I can't scroll to most of the file.
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