VPR has had built in support for reordering RR graph nodes to improve cache efficiency since verilog-to-routing/vtr-verilog-to-routing#1271.

The existing method reorders node ids externally using https://pypi.org/project/hilbertcurve, but a recent change to 2.x has broken this dependency, so that needs to be fixed, or we need to stick with 1.x.

I propose we remove the dependency on hilbertcurve and use the node reordering flag.