tab: cleanup various methods.

Formula#to_hash: cleanup method.

Revert "build: do not skip runtime deps of buildtime deps"

Use some newer Ruby syntax and improve readability.

Use some newer Ruby functionality and avoid calling `deps` multiple
times when not necessary.

Additionally, remove the unneeded `rubocop:disable`.

Improve detection of file extensions in CurlDownloadStrategy

cli : Add basic arg parser and use it for parsing `brew audit` args

fix: crash when curl is not installed

Fix `MethodDeprecatedError` output.

java_requirement, cask dsl caveats: java 10

Fix broken support GPG containers with embedded signatures

Audit use of :run dependencies.

These are a no-op so let's remove them.

/usr/bin/which -> type -P

url "https://get.filebot.net/filebot/latest/FileBot_#{version}-darwin.tar.xz.gpg"
gpg :embedded, key_url: 'https://raw.githubusercontent.com/filebot/plugins/master/gpg/maintainer.pub'

Migrated from https://github.com/Linuxbrew/brew/pull/621

keg: delete __pycache__ directory.

/bin/cat -> cat

this allows odd linux installations (Android) to function

upgrade: make pinned error have correct exit code.

Don't use Linuxbrew/homebrew-core (yet, at least).

Also, display before saying "no packages to upgrade".

Fixes #3936.

This can't be tapped on vanilla Homebrew/brew because things like e.g.
`GlibcRequirement` are missing. We will put this back when the Linuxbrew
to Homebrew migration is complete.

install: add --include-test option.

Improve external command documentation

deps: don't display recursive test dependencies.

Extract `brew bundle` and `brew services` docs from their help. Add a
little for `brew cask` until we can think about e.g. merging the
manpages.

Allow at `install` (or `install --only-dependencies`) time to specify
that test dependencies should be installed. This will allow simplifying
code in `brew test-bot`.

This could also be made an environment variable if desired by
maintainers.

append ? to git_remote_exists

add ? to svn_remote_exists

Update `rubocop-cask` to 0.17.3.

You only care about the test dependencies for the specific formula you
are testing right now.