Meta contains the meta-options and functionality that nearly every Packer command inherits.

VersionCheckInfo is the return value for the VersionCheckFunc callback and tells the Version command information about the latest version of Packer.

VersionCommand is a Command implementation prints the version.

FlagSetFlags is an enum to define what flags are present in the default FlagSet returned by Meta.FlagSet.

VersionCheckFunc is the callback called by the Version command to check if there is a new version of Packer.