Nerfed regen snowball. Now you need a grass block, not dirt.

Plus, it must be amplified at least 2.0x or it only heals. If amplified so, the grass blolck is consumed. You can regen no more chunks than you have grass blocks.

This way you can't make 16x 16x regen snowballs. If we require more than 3x amplification, you'll have to do it one at a time, which will nerf this further.
Fixed amplified snowball so it fires faster and this carries over to arrows also.