The reactor is now set in the launcher, as it is the first script to be
loaded. This should avoid race conditions when some Twisted or libervia
packages are imported and end up importing `twisted.internet.reactor`,
which installs the default reactor before the AsyncIO one. The AsyncIO
reactor is still set in `twisted.plugin.libervia_backend_plugin` (but it
no longer fails if already set), in case the backend is started as a
plugin (although this is not recommended anyway)
- updated installation to use the now standard `pyproject.toml` instead of legacy
`setup.py`. `setup.py` and other legacy files have been deleted.
- removed outdated README4PACKAGERS
- removed pylintrc which has not been correctly reviewed. Linter conf should go to
`pyproject.toml` now.
- [hatch](https://hatch.pypa.io) is now used as main building tool. However, thanks to the
use of standards, other tools can be used too.
- update .hgignore
- several dependencies version bump, with code update to adapt to changes.
