Don't clone Features during Dijkstras graph walk

We currently copy the features objects in each channel as we walk
the graph during route calculation. This implies a significant
amount of malloc traffic as the features flags object are stored
on the heap.

Instead, because they features being referenced are in the network
graph which we hold a reference to, we can simply store references
to them.

This nontrivially improves our get_route benchmark by around 5%.

Author: TheBlueMatt