simplify passing annotation data through OSRM pipeline using the node-based datastore

- separates node-based graph creation and compression from edge-based graph creation
 - moves usage of edge-based node data-container to pre-processing as well, unifying access to node-based data
 - single struct instead of separate vectors for annotation data in engine (single place of modification)

src/tools/components.cpp

@@ -55,12 +55,12 @@ std::size_t loadGraph(const std::string &path,
             continue;
         }
 
-        if (input_edge.forward)
+        if (input_edge.flags.forward)
         {
             graph_edge_list.emplace_back(input_edge.source, input_edge.target);
         }
 
-        if (input_edge.backward)
+        if (input_edge.flags.backward)
         {
             graph_edge_list.emplace_back(input_edge.target, input_edge.source);
         }