Python-lancelot

pe: better thunk handling
be2utils: fix missing call graph edges for the first vertex

**Full Changelog**: https://github.com/williballenthin/lancelot/compare/v0.9.6...v0.9.7

- be2utils: index thunks
- pe: some rough relocation handling
- pe/cfg: better handle thunks to non-imports

**Full Changelog**: https://github.com/williballenthin/lancelot/compare/v0.9.5...v0.9.6