convert-bazaar: use breezy package instead of old bzr one
Breezy is the most recent of the two, and works on Python 3 while being
compatible with the (old) Bazaar file format.
This patch contains a variety of unicode <-> bytes changes, API breakage fixing,
restoring failing imports and changing the executable from `bzr` to `brz`.
I recommend using the debian packages for `brz` and `python3-breezy` (3.1+),
because the pip package seems to be haunted by radioactive dragons.
Differential Revision: https://phab.mercurial-scm.org/D10513
[build-system]
requires = ["setuptools", "wheel"]
build-backend = "setuptools.build_meta"
[tool.black]
line-length = 80
exclude = '''
build/
| wheelhouse/
| dist/
| packages/
| \.hg/
| \.mypy_cache/
| \.venv/
| mercurial/thirdparty/
'''
skip-string-normalization = true
quiet = true