This change makes changes to allow Servo to compile with the 1.78
version of Rust:
- Dead code is removd (Rust seems to have gotten better at detecting
it).
- The `FlowRef` `DerefMut` is updated according to @SimonSapin's advice
[^1].
- The `imports.rs` now explicitly silences warnings about unused
imports.
[^1]: https://github.com/servo/servo/issues/6503#issuecomment-2066088179
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* feat: try to deduplicate imports in codegen
* feat: another attempt
* feat: start testing imports
* feat: clean all global imports
* feat: remove shared imports from CGDescriptor
* feat: remove redundant imports from CGDescriptor
* fix: formatting
* fix: remove libc (base level import)
* feat: roll back named path changes
* feat: last changes and tidy
* experiment: move imports into a separate file
* fix: extra parenthesis
* fix: remove repeated allow statement
