Bog fix

- Fixed Ui bug in packsmith
- Fixed voidbot allowing you to light candles before you even unlocked candles in the first place
You know I just realized I never say what the bots actually do in game. I'll do that next.
- Changed sand challenge to have an actual gimmick other than "the same exact gameplay loop but harder". Now, sigils during the sand challenge need sand on top of the regular resources to be purchased. The method of getting sand is a secret.