Changes

Clean up cauldron model state mapper

Cauldron fluid now applies effects for all fluids inside instead of just
water
Following effects exist:
* Water extinguishes entities as before
* Boiling liquids boil entities alive
* Hot liquids deal lava damage
* Potions apply to the player

Add config option to register more blocks as cauldron fire
Makes it better for pack makers to either replace the default fire or
add more fire types