These changes are to support packaging archives as zip files.  This is useful when you are using autobuild to construct an archive that isn't really intended to be used as an autobuild installable.  Internally autobuild can handle tarballs on any platform, but if you are making a package for windows and not installing with autobuild, it is better to use zip which is natively supported.  Changes here do the following:

1. enable the --archive-format option for autobuild package to choose the format of the package.
2. add support for reading an 'archive' entry per platform with the new 'format' element to select the archive format with the configuration file.
3. add new edit command 'autobuild edit archive' to add archive configurations.
4. add support for installing zip formatted archives.