[Tile-serving] [osm2pgsql] Add basic Doxygen framework and convert some comments (#410)

[Sarah Hoffmann]

>  struct middle_query_t {
>      virtual ~middle_query_t() {}
>  
>      virtual size_t nodes_get_list(nodelist_t &out, const idlist_t nds) const = 0;
>  
> -    // returns true if it got the relation
> +    /**
> +     * Retrives a single way from the ways storage. Returns true if the way was retrieved

Preferably use \return (or  \retval).

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https://github.com/openstreetmap/osm2pgsql/pull/410/files#r35085916
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