[Tile-serving] [osm2pgsql] Include cleanup (#467)

[Paul Norman]

This is not a complete cleanup, but what iwyu was reporting without errors on clang 3.4 and some earlier work with deheader.

Switching from `<stdio.h>` to <cstdio>` does apparently have some differences (include-what-you-use/include-what-you-use#226), but we weren't consistent about this before.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/467

-- Commit Summary --

  * Remove excess includes, switch to C++ includes
  * Header changes, guided by iwyu

-- File Changes --

    M CONTRIBUTING.md (4)
    M middle-pgsql.cpp (1)
    M middle-ram.cpp (1)
    M node-persistent-cache.cpp (10)
    M node-ram-cache.cpp (4)
    M node-ram-cache.hpp (6)
    M osmdata.cpp (1)
    M output-gazetteer.hpp (1)
    M output-pgsql.cpp (1)
    M output.hpp (9)
    M parse-o5m.cpp (13)
    M parse-o5m.hpp (3)
    M parse.cpp (12)
    M parse.hpp (6)
    M reprojection.cpp (6)
    M sprompt.cpp (7)
    M tests/test-parse-xml2.cpp (8)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/467.patch
https://github.com/openstreetmap/osm2pgsql/pull/467.diff

---
Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/pull/467
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