Added new skills ShootFireball, ShootPotion, ShootProjectile and
ShootSkull.

- shootfireball power(float):incendiary(true/false):fire_ticks(int)
- shootskull power(float)
- shootprojectile
type(arrow,egg,enderpearl,snowball):velocity(float):damage(int)
- shootpotion effect:duration:level:velocity