Volumetric fog bringup

[Try]

Fist approach to volumetric fog:

Available on current master, mapped to Extended configuration -> Radial fog

Based on:

• https://sebh.github.io/publications/egsr2020.pdf
• https://bartwronski.files.wordpress.com/2014/08/bwronski_volumetric_fog_siggraph2014.pdf

[Try]

Struggle a lot on this week with shadowmap tuning. Projective shadowmap is tricky to get working, with volumetric effects.
Most recent progress:

2022-10-20.00-07-44.mp4