[Tile-serving] [openstreetmap/osm2pgsql] Make simplify work with geoms other than linestrings (Issue #1764)

[Jochen Topf]

The `simplify()` function currently only works for linestrings.

* It should also work for multilinestrings.
* It should also work for (multi)polygons.

The problem with simplify is

a) there are many different algorithms which have different properties (I believe only Douglas-Peucker is implemented in boost::geometry which we use)
b) simplification can make geometries invalid, which is bad and we usually guarantee that we only import valid geometries. This is especially bad for polygons. 

See #1663.

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