Don't bother with old accessibility syspref.
Use `mac_os_x::settings` for general sysprefs.
Use `mac_os_x::settings` for menubar sysprefs.
Use `mac_os_x::settings` for dock sysprefs (mostly).
Use `mac_os_x::settings` for language sysprefs.
Use `mac_os_x::settings` for security sysprefs.
Use `mac_os_x::settings` for Firewall sysprefs.
Use `mac_os_x::settings` for keyboard sysprefs.
Remove Sophos config.
Don't bother hacking Safari's reader button.