Adds screen space / local reflection prototype - works almost perfectly... Has to be integrated correctly in the pipeline though (so it is not applied to transparent particles and so on). This technique allows local reflections on any surface without rendering the scene multiple times. It's limited to objects that are visible in the current frame buffer though.

* Clouds shadows are available starting from the "insane" video setting from now on
* Moves volumetric lighting prototype evaluation/sampling  from the post fragment shader to the pre post fragment shader
* Increases samples for the motion blur effect (also reduces the overall intensity)