v1.3.0: preparing for Story Mode

As I've been working on Story Mode, I realized that with all of the changes I'm making to the solar system, I'm probably introducing a lot of incompatibilities with other mods (like NH, for example). As such, I've decided that instead of building Story Mode directly into Smol Hatchling, I'll make Story Mode an addon so that the base Smol Hatchling can remain as a simple player scale manipulator. This also means that I will no longer have to update Smol Hatchling every time I release a new update for Story Mode.