To fix#2193 prefix_length member variable has been added to ParsedURL
that is set to the length of "/service/version/profile/" prefix
when the prefix is accepted by the parser.
Also BOOST_FUSION_ADAPT_STRUCT for osrm::server::api::ParsedURL
has been moved from header to url_parser.cpp to speed up compilation
of CUs that do not use the fusion adaption.
* signature changed from void() to void(engine::api::Parameters&)
* performance increase due to use "static const GrammarT" and avoid
construction and destruction of grammars during parsing
* removed code duplication in inherited grammars
* rule unlimited changed to qi::lit
* added rule size_t_
* parser accepts "&geometries=" and "&overview=" and fails at "foo"
instead of "&geometries=foo" and &overview=foo
* added expectations checks for derived grammars
* changed rules qi::list(".") to character rules '.'
