infra: switch to flit
Let's get 0.8.0 out first, then I think this is should go in. This is also part of why I added that per-file SDist/wheel test. ;)
Removing all the egg-info entries from the list was oddly satisfying.
Why are folders no longer there?
Any more blockers? This and packaging are the final blockers on getting setuptools out of reverse dependencies of pypa/build and pypa/installer so everything can be built with pep517 backends.
Let's get #527 in, a 0.8.1 out, and then go for this.
I think I am gonna make a new release with this PR if everyone is alright with that.
I don't think packaging has made release with flit yet either. Both need to happen for flit-only bootstrap chain to work.
Packaging 22.0 has now been released with flit. This is final item in bootstrap chain.