I needed to update a bunch of extensions with many config entries each. This utility will update an extension's manifest to version 2. There is still some manual work that has to be done afterwards such as marking settings public. By default it is marking "path" and "public" to false on each config setting. It also generates a descriptionmsg key that can be added to the i18n file.
I have looked over the extension manifest documentation and I believe I hit all the necessary conversions.