[Tile-serving] [openstreetmap/osm2pgsql] Refactoring of WKB code (#1469)

[Jochen Topf]

These commits refactor some of the WKB code step by step to
* make it cleaner
* pull generation of points geometries out of the `ewkb::writer_t` class to make its use faster and simpler (we'll use this in the upcoming new pgsql middle)
* fix potential buffer overflow in `ewkb::parser_t`

This leaves the WKB code a bit cleaner, there is still the `get_area()` function etc. to clean up which doesn't really belong in the `parser_t` class and some of the code should probably be moved into a `.cpp` file, but I leave that for another day.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1469

-- Commit Summary --

  * Refactoring: Move code out of ewkb:writer_t class
  * Add stand-alone function for creating EWKB point geometry
  * Reorder contents of ewkb::writer_t class
  * Clean up ewkb::parser_t and check for buffer overflow

-- File Changes --

    M src/wkb.hpp (168)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1469.patch
https://github.com/openstreetmap/osm2pgsql/pull/1469.diff

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