Make some visual adjustments to unexplored fog.
Make some visual adjustments to unexplored fog.

- Removed blue hue, as it can affect the perception of other colors in
  the game (and actually reduces contrast on some tilesets)
- Increased max fog intensity a bit to increase contrast
- Made the transition between light + heavy fog slightly less dramatic

ShieldBattery/ShieldBattery,ShieldBattery/ShieldBattery,ShieldBattery/ShieldBattery,ShieldBattery/ShieldBattery,ShieldBattery/ShieldBattery