Reformat repository using new nixfmt-rfc-style.
Instead of having to manually stub packages that should not be downloaded we instead automatically stub all packages (except a small list of whitelisted ones). Tests can re-introduce the real package by using the `realPkgs` module argument.
* Revert "i3status-rust: satisfy new 0.31 TOML output requirements (#3938)" This reverts commit 0e4c33d760. * i3status-rust: assertion for unsupported versions
0e4c33d760