Post'n'Stuff V4.2 - Godrays Without Horizon Occlusion

Changes:
- Removed the sun-reveal / horizon-occlusion feature from the godrays.
- Kept the off-screen spill behaviour, so rays can still appear when the sun is just off-screen.
- Kept the requested default godray settings:
  GODRAY_STRENGTH = 0.60
  GODRAY_LENGTH = 0.82
  GODRAY_DENSITY = 0.72
  GODRAY_SUNSET_BOOST = 0.50
