Prepare for v0.2.0 release

[nicoburns]

Prepare Stylo for a v0.2.0 release. Closes #95.

Dependencies

Before merging this and releasing we should:

• Sync (Upgrade to 2025-03-15 #148)

This PR builds on:

• Duplicate predefined counter styles (allows stylo_atoms crate to be published) #99
• Rename upstream crates to stylo* #150
• Make servo feature default #149 (this one could be dropped if it's controversial)

Notes

• I have gone for a simple versioning scheme where all stylo* crates have the same version. This means we don't have to worry about breaking vs. non-breaking changes for subcrates. And it makes it simple for consumers of Stylo to work out which version of the subcrates they ought to be depending on. selectors and servo_arc are still separately versioned.

• I propose that we (permanently) keep the following diff downstream:

  • Crate version numbers version = "x.y.z" line in Cargo.toml
  • Dependency lines for crates that live within this repo (e.g. stylo's dependency on stylo_traits, but NOT stylo's dependency on cssparser).

  This will allow us to avoid triggering Gecko's/Mozilla's auditing process every time we bump a version number. And we need to maintain some level of diff of for Cargo.toml files anyway.

Release Process

• Publish cssparser v0.35 (Bump version to v0.35.0 rust-cssparser#404)
• Upgrade the following Stylo crates to use the newly published cssparser v0.35:
  • to_shmem
  • stylo_malloc_size_of
  • selectors
  • stylo_traits
  • stylo
• Merge this PR
• Publish the crates which have a version bump (everything except to_shmem_derive and servo_arc). A release order which should work is:
  • to_shmem (now necessary because of cssparser bump)
  • selectors
  • stylo_static_prefs
  • stylo_config
  • stylo_atoms
  • stylo_malloc_size_of
  • stylo_dom
  • stylo_derive
  • stylo_traits
  • stylo

(Servo will also need to be updated to cssparser v0.35, but that doesn't block this PR or Stylo release)

[nicoburns]

I have updated this PR to also bump to_shmem. This is necessary because it depends on cssparser so it will need a new version once the new cssparser is released.

[nicoburns]

@mrobinson I've invited to all of the stylo* crates on crates.io that were registered as part of the Stylo v0.1.0 release. So if you want to have a run at publishing all the Stylo crates along with cssparser then you should now have permissions to do so (I can't add the "Servo Publish Team" to the crates as I'm not part of the team, but you should be able to).

I've also updated the PR description with my understanding of the "order of operations" required for release.