I think this is all of them.

Closes Homebrew/homebrew#32772.

These projects are currently unmaintained, and not compatible with newer
versions of ffmpeg.

This is a follow-up to bbf9f7460fc8e6e4c63f5bbe8630b11ca53f3710.

If we read from the pipe before calling Process.wait, we can avoid
spawning a thread to do the read while continuing to avoid the deadlock
that the thread was introduced to solve.

Closes Homebrew/homebrew#32649.
Closes Homebrew/homebrew#32703.

Closes Homebrew/homebrew#32743.

Ruby 1.8 doesn't support this, so we don't officially support it (yet).

This reverts commit 7d5eb6f5e2da42c1378fefb63fde55cae97a3909.

Fixes Homebrew/homebrew#32710.

 - use literal syntax
 - escape interpolated variables
 - remove intermediate variables
 - remove unnecessary capture

Closes Homebrew/homebrew#31203.

This reverts commit e81b82cc725ede00c1292a50a076bb8a652ccecd.

This reverts commit 338a451a47c884eb9ca96d7b0023417a1eaa4d3d.

This reverts commit f96ed45fe19855d0f8acc37d5d77d16d607dfce3.

This reverts commit 91be9f5344d5931ddae6e4f905c18a607fa9e9f1.

Closes Homebrew/homebrew#32472.

As this is something we support and update.

This means that taps root and `cmd` directories are added to the PATH.

This should enable migration of some of our contributed commands into
taps (e.g. `homebrew-boneyard`) and make it easy for third parties to
be able to maintain these. It might also make stuff easier for existing
tools like e.g. `brew-cask` and `boxen`.

Closes Homebrew/homebrew#32471.

This is currently still very messy and we probably want to work out the
best way to declare what parts of our DSL/what files are "public".

Still, even if this is a WIP I'd rather get something committed sooner
rather than later and start iterating on this as a replacement for
`example_formula.rb` and the formula cookbook.

To test:
```bash
cd $(brew --prefix)/Library/Homebrew && \
  rdoc formula.rb requirement.rb utils.rb &&\
  open doc/index.html
```

Closes Homebrew/homebrew#32470.