Top rust-clippy issues

lint unnecessary literal casts

A-suggestion L-lint good-first-issue hacktoberfest

New lint: warn about missing variants/fields for non-exhaustive enums/structs

L-lint T-AST good-first-issue hacktoberfest

Enhance `option_as_ref_deref` lint with the |x| &**x case

L-enhancement good-first-issue

Re-enable cast_lossless lint by default

C-needs-discussion

New lint: creation of huge array on the stack

A-suggestion E-hard L-lint

Lint for `is_empty` doesn't show the required negation in the error message

A-suggestion good-first-issue

Ignore cognitive complexity in macro expanded code

A-complexity L-enhancement good-first-issue

match_wild_err_arm: Err(_) is not wild

L-documentation L-enhancement good-first-issue

range_plus_one help suggestion should not remove braces

A-suggestion hacktoberfest

False positive on similar_names?

L-bug T-macros