Add the slasher

The Slasher should be a hostile mob that does the following:

• Camouflages in caves
• Attacks all hostile creatures (aside from the Warden)

It should have 80hp and has new attacks for every fraction

• Dive ((Full health)5 hp of damage)
• Dig ((Half health)8hp of damage)
• Slash ((Quarter health) 12hp of damage)
• Triple slash ((1/8 of health) 5hp per slash)

I think it should be introduced in a Mob vote and it will be a great nuisance in the mines