Mixup Factory v0.6: the new pilots

I announced the Mixup Factory roadmap a while ago - so long ago that it was posted on Cohost. Anyway, this update adds the last 2 pilots I announced earlier.

• New Pilot, OX: O and X take turns driving the forklift.
• New Pilot, Dark Bettie: I hope you like apples and unreadable puzzle boards.
• Added Caravan Jr. mode to 1P and 2P modes. It's the same as Caravan mode, but it lasts 2 minutes instead of 5.
• Pilot-specific forklift gimmicks can be turned off on the Controls menu.
• Pilot-specific forklift gimmicks are enabled in 2P mode by default. I bet it's hella unbalanced, but you can turn the gimmicks off, as mentioned above.

This isn't the final Mixup Factory update, but it's close.