Blender Git Loki

More RNA: objects, objects_filter (for SceneCollection), .new, remove

Add/use worksace API functions for adding/changing/deleting

Also removed anything that influences workspace user count, from now on it's simply *always* 1.

RNA (start), and some refactor (scene.main_collection)

Instead of storing a libstbase in scene, we simply store a collection, the api (RNA) is much more clear now

Merge branch 'cycles_disney_brdf' into cycles_disney_bsdf_transmittance

Removed reflection call when roughness is low because of artifacts.

Enhanced the thin surface specular transmission approximation by a simple reflection to the other side without refracting it (refraction approximately cancels for thin surfaces).

Rename Collection > SceneCollection

We may want to re-use part of this struct (or concept) for groups and armatures. But filter is something specific to SceneCollections, so may as well keep it in a separate struct, and re-evaluate that once/if we get to it.

Add workspace to bContext

Add a workspace browsing button to Info Editor header

And actually make it work.

DNA fixups

Store a workspace in each window

Some details need to be figured out still (Windows should probably be able to share an active workspace).

small typo fix for mousebased fracture, used wrong index variable name

Initially add WorkSpace ID type

Cycles: Fix Progressive Rendering

This also fixes the material and world preview bug.

Renaming RenderLayer > SceneLayer

RenderLayer was the struct for RenderResult, better not to clash namespace here. For the Python API we still stick to scene.render_layers

improved inflow, outflow and implemented initial support for moving objects

- outflow objects may move now
- inflow routine in mantaflow script now inside adaptive time stepping
- flag grid is generated from phiobs. no more "hacks" that write bit
masks by hand

TODO:
- object velocities need to be set at borders

Implement separate tension and compression components

fix for physics visualization in FM, strings for constraint identifiers were not displayed properly under windows

Separate shear damping from structural damping

Make structural springs act in both extension and compression