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Re-factor parsing code to remove duplicated parts from three parsers
(osmo5mparse.c, osmpbfparse.c and osmxmlparse.c) into a common place
(osmparser.c), also removes lots of global variables.
Change the node, way and relation count to uint64_t instead of index_t to avoid
wrap-around (although it would have been a cosmetic problem only), also removes
dependency on types.h.
Make the node, way and relation counters be 'int64_t' instead of 'long long' in
the XML parsers for consistency with the non-XML parsers.