PNG Stalkers v4 Survival Bugfix

Fixed from uploaded file:
1. Window Jester no longer uses door breaking/opening functions.
2. Door Jester door break now uses setblock destroy so the door drops as an item.
3. Natural stalker spawn timing is now 15 minutes minimum and 1 hour maximum.
4. Added a global 15-minute natural spawn cooldown after a stalker/window/door event.
5. Attack distance changed from 6.5 blocks to 5 blocks.
6. Fixed auto/jester_grin recursive bug.
7. Auto spawn now cycles through Red, Smile, Golden, Twixels, and Jester instead of mostly Red.

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