Welcome to the team!

cmd/upgrade: Add call to parse options

Note leadership changes

Cask handle already downloaded file

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

Today the Homebrew maintainers elected a new PLC, TSC and project lead.
Documentation is to follow detailing exactly the responsibilities for
each of these roles but adjust these to reflect the current state until
that point.

cleanup: fix stale cask detection.

This method is also run to check formulae and if a formula and cask have
the same name (e.g. `cmake`) then this method would mark all formulae
downloads to being stale.

Instead, check the `dirname` (which we're using for globs anyway) to
double check that this is definitely a stale cask.

Note HOMEBREW_NO_INSTALL_CLEANUP in the help/manual

update-reset: avoid hanging on shallow-since.

For some reason this seems to hang when there's been no commits since
the latest tag. Not a problem in `brew update`.

The current logic for curl_download tries to restart any existing
partial download, but this fails for some servers when the file is
already fully downloaded, returning a status code 416. This updates the
function to check for the file being already downloaded and if so bails
early.

The following command used to fail when run more than once but now works
as expected:
```
brew cask info https://raw.githubusercontent.com/homebrew/homebrew-cask/master/Casks/docker.rb
```

fix typo

Use Mechanize to parse Content-Disposition.

cleaner: only skip non-.la symlinks

Finish option handling

ries.

Reopens Homebrew/homebrew-core#35269.
Closes Homebrew/homebrew-core#35269.