Changelog

[2018.2 undecided]

Fix ConvertPhysicalLightIntensityToLightIntensity() function used when creating light from script to match HDLightEditor behavior

Screen Space Refraction projection model (Proxy raycasting, HiZ raymarching)
Screen Space Refraction settings as volume component
Added buffered frame history per camera
Port Global Density Volumes to the Interpolation Volume System.
Optimize ImportanceSampleLambert() to not require the tangent frame.
Generalize SampleVBuffer() to handle different sampling and reconstruction methods.
Improve the quality of volumetric lighting reprojection.
Optimize Morton Order code in the Subsurface Scattering pass.
Planar Reflection Probe support roughness (gaussian convolution of captured probe)
Use an atlas instead of a texture array for cluster transparent decals
Add a debug view to visualize the decal atlas
Only store decal textures to atlas if decal is visible, debounce out of memory decal atlas warning.
Add manipulator gizmo on decal to improve authoring workflow
Add a minimal StackLit material (work in progress, this version can be used as template to add new material)

EnableShadowMask in FrameSettings (But shadowMaskSupport still disable by default)
Forced Planar Probe update modes to (Realtime, Every Update, Mirror Camera)
Removed Planar Probe mirror plane position and normal fields in inspector, always display mirror plane and normal gizmos
Screen Space Refraction proxy model uses the proxy of the first environment light (Reflection probe/Planar probe) or the sky
Moved RTHandle static methods to RTHandles
Renamed RTHandle to RTHandleSystem.RTHandle

Fix fog flags in scene view is now taken into account
Fix sky in preview windows that were disappearing after a load of a new level
Fix numerical issues in IntersectRayAABB().
Fix alpha blending of volumetric lighting with transparent objects.
Fix the near plane of the V-Buffer causing out-of-bounds look-ups in the clustered data structure.
Depth and color pyramid are properly computed and sampled when the camera renders inside a viewport of a RTHandle.

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