[Tile-serving] [openstreetmap/osm2pgsql] Add implementation of simplify function for multilinestrings (PR #1782)

[Jochen Topf]

We already have an implementation for linestring, which is slightly improved in this commit. Simplification for anything other than (multi)linestring is not supported.

In the first commit there is also a refactor of the `fill_point_list()` function which makes the code more readable and consistent.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/osm2pgsql/pull/1782

-- Commit Summary --

  * Refactor: Make fill_point_list return a bool showing validity
  * Add remove_duplicates() and is_valid() functions for linestrings
  * Implement simplify for multilinestrings

-- File Changes --

    M src/geom-from-osm.cpp (25)
    M src/geom-functions.cpp (47)
    M src/geom.cpp (6)
    M src/geom.hpp (16)
    M tests/test-geom-linestrings.cpp (38)
    M tests/test-geom-multilinestrings.cpp (42)

-- Patch Links --

https://github.com/openstreetmap/osm2pgsql/pull/1782.patch
https://github.com/openstreetmap/osm2pgsql/pull/1782.diff

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