Tracking issue: Stylo v0.2.0 release

[nicoburns]

Tracks the initial 0.2 release of Stylo on crates.io.

Crate status

Crate	Changed	Notes	Owner(s)	Team
to_shmem	No	Published as stylo_to_shmem and to_shmem.	delan	Yes
to_shmem_derive	No	Published as stylo_to_shmem_derive and to_shmem_derive	delan	Yes
malloc_size_of	?	To be published as stylo_malloc_size_of	nicoburns	No
servo_arc	No	Published as both servo_arc and stylo_arc. Both are up to date.	emilio, simonsapin	Yes
selectors	Yes	Small but breaking change	emilio, simonsapin	Yes
stylo_atoms	Yes	Atoms list changed	nicoburns	No
stylo_dom	Yes	Now depends on malloc_style_of	nicoburns	No
stylo_static_prefs	Yes	New prefs added	nicoburns	No
stylo_config	Yes	Non-breaking change	nicoburns	No
style_derive	Yes	Non-breaking change	nicoburns	No
style_traits	Yes	To be published as stylo_traits	nicoburns	No
style	Yes	To be published as stylo	nicoburns	No

Depends on

• Remove dependency on webrender_api #92
• Remove Servo-specific code from malloc_size_of #91
• Don't use a cross-crate include!() macro for counter style atoms (Duplicate predefined counter styles (allows atoms crate to be published) #99)
• Rename crates from style to stylo (https://bugzilla.mozilla.org/show_bug.cgi?id=1938783)
  • Crates that are upstream (style, style_traits and style_derive, malloc_size_of)
  • Crates that are not upstream (atoms, dom, style_config, style_static_prefs)
• Add README.md to stylo crate (this is what will appear on the crates.io listing).
• Update Cargo.toml metadata for release. Ensure that all crates have up-to-date listings for the following keys (version, authors, documentation, description, repository, license, edition, publish)
• Bump version numbers for release

Optional tasks

• Upgrade crates to 2021 edition
• Upstream remaining diff
• Re-export crates from style crate to make it easier to depend on
• Improve lib.rs documentation for stylo crate
• Publish malloc_size_of on crates.io (bugzilla.mozilla.org#1933341)