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

[Sarah Hoffmann]

I've added commits for removing the tags column in the nodes table and reformatting node-ram-cache.

I've also had to add a try/catch around the get() function for the dense node cache as unknown ids throw an exception. There is a small penalty attached to that but not enough to block this PR. @joto will look into providing an exception free get() function on the libosmium side at some point.

If rendering results look ok, then this is good to go for me.

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