all parameters of the bilateral blur can now be set from the CPU,
instead of being hardcoded -- this probably prevent the shader compiler
from unrolling the filter, but it's also probably not a big deal.
additionally, we now use a kernel size of 23 (12 samples) when the
SSAO quality is set to HIGH or more.
ssaogen is no longer needed
Higher quality levels used to darken the ssao a lot, now they all have
a consistant look.
Add quality control to material sandbox.
Slightly simplify shader code.
c3c535e256