Moved game over to butler and git!

I moved the game over to butler, so automatic updates would be possible via the itch app (download here). If you haven't already, you should get the itch app to get automatic updates, and also you can easily switch what version of the game you play. Update: now I don't want to recommend the itch app, because it's extremely buggy for me and sometimes it just refuses to open the game, but if it works for you then that's good.

Also, I finally decided to move the game to git, so now I won't have to worry about losing the entire file if something bad happens. This was long overdue, but I'm glad it's finally done.