Witch Potions Cauldron

Big Update
Added:
- Updated to 1.9 (only work with 1.9)
- made the code smaller for better performance
- added lingering potions and can be crafted to arrows
this means arrows can have like 7 potions effect inside
each arrow
- remove economy support.

USAGE:
- you have a cauldron and put the potions if in the mix
is one splash potion the mix will return a splash potion
with all the potions inside, if in the mix is a lingering potion
the mix will return a lingering potion with all potions inside

TO-DO:
comment.