- AtmosphericScatteringXXX files where definition/editor and shader code of the fog functions are and that are used by any shader where fog is needed (full pass opaque fog, transparent forward materials...)
- Implemented basic linear/exponential fog with Uncharted 4 "Mip Sky" color fetch trick.
- rename _LinearFogOoRange as _LinearFogOneOverRange
- add _BLENDMODE_ACCURATE_LIGHTING keyword
- change _ENABLE_FOG to _ENABLE_TRANSPARENT_FOG
- update test scene
- fix issue with refractoinMask not correct by default- rename
_LinearFogOoRange as _LinearFogOneOverRange
- add _BLENDMODE_ACCURATE_LIGHTING keyword
- change _ENABLE_FOG to _ENABLE_TRANSPARENT_FOG
- update test scene