0.50.1: Artisanal Clothes Pegs Fixup Edition

Breaking

• None.

Experimental

• None.

Enhancements

• Moved the validation of doc comments in local scopes out of
  orphaned_doc_comment and into a new opt-in local_doc_comment rule.
  JP Simard
  #4573

• SwiftLint's Swift Package Build Tool Plugin will now only scan files
  in the target being built.
  Tony Arnold
  #4406

Bug Fixes

• Fix building with swift build -c release.
  JP Simard
  #4559
  #4560

• Fix false positives in lower_acl_than_parent when the nominal parent
  is an extension.
  Steffen Matthischke
  #4564

• Fix minimum_fraction_length handling in number_separator.
  JP Simard
  #4576

• Fix false positives in closure_spacing.
  JP Simard
  #4565
  #4582

• Fix line count calculation for multiline string literals.
  JP Simard
  #4585

• Fix false positives in unused_closure_parameter when using
  identifiers with backticks.
  JP Simard
  #4588

• Fix type_name regression where names with backticks would trigger
  violations.
  JP Simard
  #4571