[Tile-serving] [openstreetmap/osm2pgsql] Save unprojected coordinates in node caches and use osmium dense file array (#668)

[Paul Norman]

> The main drawback is that some coordinates now may need to be reprojected multiple times. This is for example the case for nodes where roads cross each other. OTOH unused nodes are no longer converted

This should be an overall savings by my estimates.

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