New Crossbow enchantment: Sniping

Sniping would be mutually exlusive with Piercing and Multishot, and would go up to level 5

This enchantment would increase the damage dealt by an arrow based on how much distance it has travelled, by level+1 damage every 5 blocks the arrow flew, up to a maximum boost of 60 points of damage after travelling 50 blocks

This only applies to arrow travelling through air: the enchantment won't work in water or lava: if the arrow begins to travel in one of these 2, the damage already added will remain, but the arrow will no longer increase its damage as long as it is in water or lava