[Tile-serving] [openstreetmap/osm2pgsql] make tile expiry a proper C++ class (#587)

[Sarah Hoffmann]

- use unique_ptr for subtile managment and get rid of explicit malloc/free
- only save required options instead of reference to options
- hand in filename and minzoom as parameters to output_and_destroy(), they are not needed otherwise
- fix formatting where code was changed
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/587

-- Commit Summary --

  * make tile expiry a proper C++ class

-- File Changes --

    M expire-tiles.cpp (334)
    M expire-tiles.hpp (57)
    M options.cpp (4)
    M options.hpp (2)
    M output-multi.cpp (14)
    M output-pgsql.cpp (15)
    M tests/test-expire-tiles.cpp (83)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/587.patch
https://github.com/openstreetmap/osm2pgsql/pull/587.diff

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