Make the Homebrew/cask and Homebrew/homebrew-core style more closely
match the rest of Homebrew.
To accomplish this:
- Run `brew cask style` to ensure we don't break style there when
making changes or upgrading RuboCop in Homebrew/brew.
- Fix the HomepageMatchesUrl cop to better handle weird input.
- Remove the now unneeded `.rubocop_shared.yml`
- Fix the cask fixtures with `brew cask style --fix`.
- Share more style between Homebrew/brew, casks and formulae.
In some cases, certain Casks shouldn't be resubmitted for specific reasons: difficult to maintain, developers maintain their own version, ...
To make sure these cases are restricted - we can add them to a blacklist and have the blacklist checked as part of the `brew cask audit` steps.
