Blender Git Loki

Merge branch 'master' into fluid-mantaflow

Added a prototype for the blur node, to test the needs for sampling

Support for basic layer selection

Adds basic selection using LMB. Doesn't include selection with ctrl, shift, etc.

Scrolling support for layer manager editor

Vertical scrolling only for now.

Use derivative functions for calculating dual values using the forward accumulation method.

Only a few functions have derivatives defined yet.

Add layer manager theme settings to UserPrefs

Prepare layer manager editor code for further changes

* Add (empty) keymap for layer manager
* Move list drawing into own file
* Add and use a LayerTreeItem wrapper for drawing in editor (will be used later for extra drawing info).

Reading material groups now works again.

It does not read material data as those aren't typically written in .abc
archives, so the materials added only have default values.

SVM and OSL are both working for the simple version of the Disney BRDF

Disney node can be used without SVM and started to cleanup the OSL implementation

There is still some wrong behavior for SVM for the Schlick Fresnel part at the
specular and clearcoat

Switched from a parameter struct for Disney parameters to ShaderClosure params

Added additional variables for storing parameters in the ShaderClosure struct

added output parameter to the DisneyBsdfNode

That has been forgotten after removing the inheritance of BsdfNode

removed BsdfNode class inheritance for DisneyBsdfNode

That's due to a naming difference. The Disney BSDF uses the name 'Base Color'
while the BsdfNode had a 'Color' input. That caused a text message to be
printed while rendering.

disney implementation cleaned

added the disney brdf as a shader node

added clearcoat implementation

disney diffuse und specular implemented

disney diffuse is working correctly

added vessel for disney diffuse shader