New versions

[madsmtm]

Release checklist:

• The branch is named new-versions, such that the full CI will run.
• Changelogs have only been modified under the Unreleased header.
• Version numbers are bumped in the following order:
  • objc2-proc-macros
  • objc-sys
  • objc2-encode
  • objc2
  • block2
  • Framework crates
• Local tests have been run (see helper-scripts/test-local.fish):
  • macOS 10.14.6 32bit
  • iOS 9.3.6, 1st generation iPad Mini

Post merge:

• A tag is created on the merge commit for each new version.

[madsmtm]

Wow, this one was a mess... I hit an issue with the version of Cargo I was using (several times), presumably rust-lang/cargo#13843, which prevented it from transforming the lints.workspace = true field before publishing, and then I also had to fork cargo-release to allow releasing more than 30 crates at a time, and objc2-ui-kit hadn't gotten its maximum features bumped, and so on... But, it's mostly done for now, I really hope the next one's going to be easier.