[Tile-serving] [openstreetmap/osm2pgsql] WIP: Add code to generalize polygons using two different strategies (PR #1830)

[mboeringa]

A few more remarks:
- I also recommend testing any generalization algorithm at a global scale. Small regional extracts may not reveal all issues, especially related to the anti-meridian, and how some PostGIS commands deal with that.
- Mind the "fine print" with any of the 'ST_Simplify/ST_SimplifyPreserveTopology/ST_SimplifyVW' PostGIS commands as listed in the PostGIS documentation.
- Output from the current, non-generalized, osm2pgsql processing pipeline, has shown to be very robust in both QGIS and ArcGIS for me, with fully valid readable output, even with the more advanced 'flex' processing. 

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