Genbadge

- Fix branch coverage rate comparison when used with --branch without actual branches. Fixes
[23](https://github.com/smarie/python-genbadge/issues/23). PR
[37](https://github.com/smarie/python-genbadge/pull/37) by [marcegeek](https://github.com/marcegeek).
- Removed python 2.7, 3.5, 3.6 and 3.7 from CI. This version is the last where python versions < 3.8 are officially
supported.
- Refactored project layout so that tests are not packaged in wheel.
- `conda` is not the backend virtual environment anymore. Fixes [35](https://github.com/smarie/python-genbadge/issues/35).

- Fixed support for Python 3.12 by adding `setuptools` requirement explicitly. Fixed
[32](https://github.com/smarie/python-genbadge/issues/32).
- Fixed support for `Pillow` version 10 or greater. PR [33](https://github.com/smarie/python-genbadge/pull/33) by
[famura](https://github.com/famura).

- A new `-n/--name` commandline option can be used with all badge generation commands to override the badge label (left text). A `--noname` commandline flag can alternatively be used to remove the left part completely. PR [25](https://github.com/smarie/python-genbadge/pull/25) by [`nefrob`](https://github.com/nefrob).

- Fixed the badge generator in "local" mode (badge created from local SVG template, not downloaded from shields.io). Fixes [19](https://github.com/smarie/python-genbadge/issues/19). PR [#20](https://github.com/smarie/python-genbadge/pull/20) by [`texnofobix`](https://github.com/texnofobix).

- Removed dependency to `xunitparser` because its packaging relies on `use_2to3` which is not supported anymore in setuptools. Fixes [18](https://github.com/smarie/python-genbadge/issues/18).

- `genbadge coverage`: fixed `ZeroDivisionError` when `coverage.xml` contains 0 branches (in particular when `--no-branch` option is set). Fixes [15](https://github.com/smarie/python-genbadge/issues/15)