[Tile-serving] [osm2pgsql] Try cppformat as a replacement for boost:format (#398)

[Sarah Hoffmann]

The boost::format library is known to have a very bad performance. A recommended replacement is the [cppformat library](https://github.com/cppformat/cppformat). We should try that.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/398
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