This enables clippy in CI and suppresses most of the existing
warnings. We can drill down and fix those later, but this will
help start getting things under control.
Consolidate package configuration where possible. This also
removes the `homepage` key as it only points to the repository
so isn't providing anything additional.
Use workspace dependencies for the crates provided by the workspace
and used within the workspace. This centralizes the version number
maintenance a bit.
Note that it is buildable on non-macos platforms because Cargo does not
yet have conditional dependencies and several non-macos Servo things
depend on it when on macos.
Bruce Mitchener