[Tile-serving] [osm2pgsql] Remove the global text-tree string storage and make keyval a real class (#240)

[Paul Norman]

> t also might be better to get rid of the remaining hand-allocated char* strings before rewriting keyvals to have more readable code to start with.

I had a go at this a couple months back - I think the key is to start at the right part so you can only convert part of it, or else it's a really big job. I didn't start at the right part.

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