PNG Stalkers v6 - 2 Block Attack + Faster Chase

Fixed:
- Main stalkers now only damage players within 2 blocks.
- This should stop them killing you from outside your house unless you are very close/pressed against the wall.
- Chase movement now continues until 2 blocks away instead of stopping around 5 blocks.
- All main stalkers are faster, around slightly faster than a sprinting/sprint-jumping player.

Commands:
 /function pngstalksafe:version
 /function pngstalksafe:changes
 /function pngstalksafe:spawn/all
 /function pngstalksafe:kill_all
