package up MultiMC-importable instance zip
This should allow for easy setups of new multimc instances. It will contain no mods, configs or any other MC stuff apart from the Forge build details and the updater. The updater's config should not need to be edited manually as it will be generated if it's not present (requires #9 (closed)) and details for ClientID/Secret and Optional Mods should be obtained via a small GUI (#7). may also only need to be released once as self-updating of the updater (#6 may help with that).
This is not an urgent project.