Just some general polishing for the statue mobs.

Statue mobs can't change their direction while seen.
Lowered the range for flickering lights.
Lowered the cooldown for blinding people, added user feedback when the spell is used.
The blindness spell will affect people within objects.
Merge pull request #2693 from Giacom/spooky_scary_statues

Just some general polishing for the statue mobs.