Refactor global `Cask::Config`.

Library/Homebrew/cask/auditor.rb

Library/Homebrew/cask/cask.rb

Library/Homebrew/cask/cask_loader.rb

Library/Homebrew/cask/caskroom.rb

Library/Homebrew/cask/cmd.rb

Library/Homebrew/cask/cmd/abstract_command.rb

Library/Homebrew/cask/cmd/audit.rb

Library/Homebrew/cask/cmd/upgrade.rb

Library/Homebrew/cask/config.rb

Library/Homebrew/cask/installer.rb

Library/Homebrew/cli/args.rb

Library/Homebrew/cli/named_args.rb

Library/Homebrew/cmd/outdated.rb

Library/Homebrew/test/cask/artifact/binary_spec.rb

.../Homebrew/test/cask/cask_loader/from__path_loader_spec.rb

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

Library/Homebrew/test/cask/cmd/cat_spec.rb

Library/Homebrew/test/cask/cmd/install_spec.rb

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

Library/Homebrew/test/cask/cmd/uninstall_spec.rb