[Tile-serving] [openstreetmap/osm2pgsql] Support PROJ >= 6.0.0 (#922)

[Sarah Hoffmann]

#1066 reorders the code so that it becomes fairly easy to implement a generic projection using the proj6 variant and then have cmake detect which one to use. Just add a `reprojection-generic-proj6.cpp` similar to the existing `reprojection-generic-proj4.cpp` implementation.

PRs would be most welcome.

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