Include bb addresses in cfg output

[daverigby]

It would be useful to include the addresses of the basic blocks in the cfg output - for large functions in particular it is hard to map code to the PDF CFG without knowing which the addresses the lines came from.

[Kazhuu]

Yeah this is nice addition indeed. If someone is willing to contribute a PR about this improvement it would be nice. At the moment though I'm waiting for the bigger refactoring PR #45 to get ready so I can help the author to work on it and minimize the differences between two branches 👍