Fixes that directional light sources were more or less broken in the deferred pass and normalizes the Blinn-Phong shading model (makes it energy conserving).

* Tweaks all lighting values accordingly
* Adds different specular intensities for water at night and during the day
Tweaks some more lighting related values and removes that the HDR exposure threshold is different from the one used during daytime (removes fading at dawn/noon).
Slightly tweaks forward chunk shading parameters to match the deferred counterparts.
Increased light intensity during nights by 2.5% to match the overall setting.
Adds some more water related lighting tweaks.