Add April Fools' Updates

[lost mirage]

It would be cool if we were able to play the April Fools' updates after they've already been released. Not many ppl play singleplayer on lunar but it would be a nice touch, especially since playing old versions is a major feature of Java.

[final frigate]

yes, it would be very fun

but since april fools is not an official update, it is hard for them to develop mod compatability with these

[hazy stratus]

^