Rust tool to convert IPFire Location dump into CSV format.

The IPFire people provide a tool that collects data from several top-level sources, combines it into a single database, and annotates it with optional overrides. This tool transforms the "dump" format of their database into the form Tor expects.

If you want to try this yourself, note that performance will be poor until the next release of the rangemap crate, due to https://github.com/jeffparsons/rangemap/pull/27

No changes file, since this is not a Tor code change.