Create public facing libraries for extractor, contractor and datastore

New libraries libosrm_extract, libosrm_contract, libosrm_store

src/osrm/osrm.cpp

@@ -0,0 +1,22 @@
+#include "osrm/osrm.hpp"
+#include "engine/engine.hpp"
+#include "engine/engine_config.hpp"
+#include "engine/plugins/plugin_base.hpp"
+#include "storage/shared_barriers.hpp"
+#include "util/make_unique.hpp"
+
+namespace osrm
+{
+
+// proxy code for compilation firewall
+OSRM::OSRM(engine::EngineConfig &config_) : engine_(util::make_unique<engine::Engine>(config_)) {}
+
+// needed because unique_ptr needs the size of OSRM_impl for delete
+OSRM::~OSRM() {}
+
+int OSRM::RunQuery(const RouteParameters &route_parameters, util::json::Object &json_result)
+{
+    return engine_->RunQuery(route_parameters, json_result);
+}
+
+}