PNG Stalkers v43 locked spawn/sound fix

This version fixes the broken v42 spawn commands.

Changes:
- Removed invalid 1.20.1 command usage that was breaking the spawn functions.
- Restored visible floating PNG stalkers.
- Fixed jester_grin spawn; it is not recursive.
- All stalkers use invisible Giant hitboxes so they can be damaged much easier.
- 100 hearts / 200 health per stalker.
- All stalkers attack Survival/Adventure players by command.
- chase_1.ogg is trimmed to first 4 seconds, louder, and loops while a stalker is nearby.
- dweller_hurt_4.ogg is re-encoded and plays when the hitbox is hurt.
- Auto-spawn cycles between 5 and 20 minutes.
- Door/window logic kept from the previous patch.

Important:
Fully quit Minecraft and reopen after replacing the jar. Then run:
 /reload
 /function pngstalksafe:test_chase_sound
 /function pngstalksafe:spawn/red_stalker

Note:
Full copyrighted songs are not packaged in this jar.
