PNG Stalkers Safe Real Attack v7

Fixes:
- The window head now turns into a REAL hidden Husk attacker after 20 seconds.
- The PNG Jester visual follows that hidden mob.
- In Survival/Adventure the attacker damages the player.
- Creative is NOT attacked.
- Window Peek Jester can also trigger the attacker if you get basically inside the head.
- Normal stalkers still use blackout + vanish.

Commands:
/function pngstalksafe:spawn/jester_window_peek
/function pngstalksafe:spawn/jester_attack
/function pngstalksafe:spawn/jester_grin
/function pngstalksafe:spawn/all
/function pngstalksafe:auto/on
/function pngstalksafe:auto/off
/function pngstalksafe:kill_all
/function pngstalksafe:test_music
/function pngstalksafe:stop_music
