Blender Git Loki

Cleanup: remove BLI_blenlib from ghash header

This causes source files to depend on ghash header
for BLI_string/rect/listbase.

Also quiet warnings.

BLI: sync changes from 2.8

Cycles: Make per-object random value output also work for Lamps

Cycles: Refactor closure roughness detection to fix a potential bug with Denoising of specular shaders

Eevee: SSS: Add Quality settings.

Samples : pretty self explanatory.
Jitter Threshold : Reduce cache misses and improve performance (greatly) by lowering this value. This settings let user decide how many samples should be jittered (rotated) to reduce banding artifacts.

Eevee: Initial Separable Subsurface Scattering implementation.

How to use:
- Enable subsurface scattering in the render options.
- Add Subsurface BSDF to your shader.
- Check "Screen Space Subsurface Scattering" in the material panel options.

This initial implementation has a few limitations:
- only supports gaussian SSS.
- Does not support principled shader.
- The radius parameters is baked down to a number of samples and then put into an UBO. This means the radius input socket cannot be used. You need to tweak the default vector directly.
- The "texture blur" is considered as always set to 1

DRW: Better stencil support.

A stencil mask is now assigned to each shading group and the stencil test is defined like the depth test via the DRW_STATE_* defines.

GPUTexture: Add for stencil to default depth buffers.

Theses will be used by eevee SSS.

TODO: only allocate stencil if needed.

GPUMaterial : Add sss_data to Closure struct.

Fix quick smoke getting view_render from the wrong place

Cleanup on depsgraph logic

Merge remote-tracking branch 'origin/master' into blender2.8

Depsgraph: Fix relations for metaballs

Initially spotted and investigated by Dalai and Germano.

Cycles: Fix compilation error of standalone application

Cycles: Fix compilation error with OIIO compiled against system PugiXML

Fix T53289: CUDA missing textures not showing pink, after recent changes.

Fix T53273: render bake settings properties not showing correct Python path.

Fix T53294: bpy.ops.image.open crash

BMesh Py API: Expose color alpha

GPUFramebuffer: Add possibility to blit stencil buffer.