Pre-december update

- A new "secret" feature
- An upcoming "event" (can be disabled)
- Empty cardboard boxes get destroyed when picked up with 0 uses
- Holding shift shows more items / potion effects in cardboard box /
slime in a bucket tooltip
- Fix cardboard box tooltip showing incorrect amount of "more items"
- Fix NbtUtils.createList and createCompound not accepting NBTBase
values