Big update!

-Added the Reward Chest; a chest, that spawns as a reward for killing the Wither and the Ender Dragon. Now except of the souls of the stars and souls of the wither being dropped, they are found in the reward chest, along with a couple of useful items. The Reward Chest cannot be collected in survival.

-Remade the effect of the Miracle Berry; now, after you eat the Miracle Berry, the effect lasts until you die. Upon dying, keep inventory is turned off, and to turn it back on you have to eat the Miracle Berry again. You can edit this with the new gamerule - lastingmiracleberry, which when turned on, makes the effect stay with you even after death.

-Added a new advancement - "The Miracle", which is achieved by eating the Miracle Berry for the first time.