use tiles::hybrid_node_idx

[felixguendling]

to store node coordinates on disk

[felixguendling]

Import with Bayern:

Master branch:

This branch:

Biggest gain would probably be to not store osm_node and osm_edge in unique_ptr but have a vector and only store IDs.

Edit: osm_edge is stored in osm_node for outgoing edges. So probably a memory fragmentation can be reduced with cista::vecvec<edge_idx_t> for edges and reverse edges + one central cista::vector_map<edge_idx_t, edge> map.