.meta file binder update

This PR changes `.meta` file from containing a single blueprint for the eponymous export of a module, to containing a `module-binder`, a binder for a module containing a blueprint for each export.

The .meta files in the Montage were updated using this script at https://gist.github.com/Stuk/1ec8d466b3f792ed53b7 . We should hold off updating .meta files in other projects until further changes using the `ModuleReference` from #1225 have been made.