Add unified Subsurface Scattering support for skin shadiing, previously every light type implemented this differently causing shading differences, now baked lights show this correctly too
https://files.facepunch.com/sam/1b2711b1/k5L2Punaav.png
Readd SetShadowCascadeResolution and SetShadowCascadeDistance as stub obsolte methods to not break existing games