Fixes some things in my previous commit and adds various rendering related tweaks and fixes.

* Fixes water diffuse and specular lighting - totally bricked that - cleaned up the shader while I was at it
* Fixes that random torchlight colors are now actually random
* Tweaks default light component values
* Tweaks light falloff equation
* Fixes that the sky texture was way too bright all the time - much brighter than the scene
* Since the above is fixed, adds that daylight block light is a bit brighter so everything feels more like actual sunlight
* Reduces size of bloom render target of 1/8 to 1/16 - but increases of high-pass render target to 1/2
* Adds various other minor tweaks and fixes (sets daylight min exposure value to 1.0, ...)
* Adds high-pass and bloom render targets to the debug shader
* Adds some cleanups in the debug shader