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For a long time people have requested some sort of configuration files for Homebrew. Now: here's the first version of that. Similarly to how you can configure Git for a system, a repository or a user: you can configure Homebrew for a system, a prefix or a user. The system-wide configuration file is `/etc/homebrew/brew.env`, the prefix-specific configuration file is `$HOMEBREW_PREFIX/etc/homebrew/brew.env` and the user-specific configuration file is `~/.homebrew/brew.env`. As we need to read these files from Bash in `bin/brew` (so they can) influence functionality ASAP: they are in a simple format that Bash can read. It may be that we have more complex array or hash data in future that's configured through JSON or YAML (most likely JSON as we use it more) and stored in a `brew.json`/`brew.yaml` file in the same directory. As this is relying on `eval` in Bash which is fairly dangerous: we filter the lines with a regex to ensure we're only permitting setting `HOMEBREW_*` variables and nothing more. To give a bit of power to system administrators, the `HOMEBREW_SYSTEM_ENV_TAKES_PRIORITY` variable can be set in `/etc/homebrew/brew.env` to ensure that the system-wide configuration file is loaded last and overrides any prefix or user settings. Now that we have an actual location for configuration files, let's also change the `brew livecheck` watchlist configuration file to be in this directory and deprecate the existing location. As this is a developer command and the mitigation is to just move the file: we don't need to follow the normal deprecation process here.