cli/args: add formulae_paths helper.

None of these made sense as end-user commands.

This makes these commands robust to invalid syntax.

This allows getting the formulae passed as arguments while not having
to read the file or raising an exception on invalid syntax.

dev-cmd/extract: instruct users to run git fetch unshallow

More RuboCops fixes

Also, clarify where `brew readall` is run.

This stops stuff like `clang=1` from being matched incorrectly.

pr-pull: eliminate another curl call

Delete trailing `;` in Content-Disposition header.

We're setting the basename, so no need to make a curl call to figure out
what it ought to be. This should speed up bottle pulls even more.

utils/github: form encode workflow branch

docs/Releases: various updates.

Update with and based on the release process video I recorded.

`brew style` fixes

Otherwise this is just doing `rubocop` checks.

This is no longer used anywhere.

dev-cmd/pr-pull: fix strategy error

dev-cmd: add pr-automerge

pr-pull: fix to fetch extra-large bottles

Co-Authored-By: Mike McQuaid <mike@mikemcquaid.com>

formula: add on_macos and on_linux

audit whether GitHub prerelease or not

ENV/std: conditionally apply AES-NI workaround

ENV/std: remove space in -isysroot

audit: fix keg_only check