PNG Stalkers v46 Visibility + Song Timer Fix

Changes:
- Removed blindness effect. Darkness stays, but you should be able to see much farther than 1-2 blocks.
- Darkness range is now tuned closer to a 15-block horror view instead of total blindness.
- Spawn songs now last 30 seconds max.
- Song timer keeps running even if the stalker kills you, then stops the song.
- Rudolph was rebuilt starting at the 30 second mark, cutting off the first 30 seconds.
- Run Rabbit Run stays normal.
- kill_all and stop_music still stop songs instantly when you run them.

Commands:
 /function pngstalksafe:test_chase_sound
 /function pngstalksafe:spawn/red_stalker
 /function pngstalksafe:spawn/jester_grin
 /function pngstalksafe:kill_all
