Potions Master

adds cauldron, and new mechanic: Mixing Potions! place the Cauldron on top of a campfire, right click the cauldron with any 2 potions, and one glowstone. light the campfire if it is not already lit. wait until the mixture reduces in size, then right click the top of the cauldron with an empty bottle. the resulting potion can be put back in to combine with other potions.