Remove `Hbc::Scopes`.

Library/Homebrew/cask/lib/hbc.rb

Library/Homebrew/cask/lib/hbc/cask.rb

Library/Homebrew/cask/lib/hbc/caskroom.rb

Library/Homebrew/cask/lib/hbc/cli/audit.rb

Library/Homebrew/cask/lib/hbc/cli/internal_stanza.rb

Library/Homebrew/cask/lib/hbc/cli/list.rb

Library/Homebrew/cask/lib/hbc/cli/outdated.rb

Library/Homebrew/cask/lib/hbc/cli/search.rb

Library/Homebrew/cask/lib/hbc/cli/style.rb

Library/Homebrew/cask/lib/hbc/cli/upgrade.rb

Library/Homebrew/cask/lib/hbc/scopes.rb

Library/Homebrew/test/cask/cask_spec.rb

Library/Homebrew/test/cask/cli/audit_spec.rb

Library/Homebrew/test/cask/cli/style_spec.rb

Library/Homebrew/test/cask/scopes_spec.rb