`#[pyclass]` now accepts `rename_all = "renaming_rule"`: this allows renaming all getters and setters of a struct, or all variants of an enum. Available renaming rules are: `"camelCase"`, `"kebab-case"`, `"lowercase"`, `"PascalCase"`, `"SCREAMING-KEBAB-CASE"`, `"SCREAMING_SNAKE_CASE"`, `"snake_case"`, `"UPPERCASE"`.
