Blender Git Loki

Merge branch 'blender2.8' into hair_guides

Construct hair strands data from hair systems (no real UV/MCol yet).

Extend default material function for Eevee to work with hair systems.

Fix a few minor crashes from unfinished hair shader code.

Remove the parent interpolation hair shader and use the transform-feedback shader instead.

Remove the mesh sample from fiber curve data.

Fiber curves are simple shapes for fibers now, not tied to a particular
place on the scalp mesh (cf. shape keys).

Fix fur curve generation function.

Simple hair curve generation for testing per-follicle curves.

Add common ui draw function for hair display settings.

Remove unused properties_hair.py file.

Fix ui script for the hair modifier.

Replace parent indices and weights with single curve index.

Curves can be shared between follicles, but there will only be one
curve per follicle for defining the shape.

Rename "guide" curves to "fiber" curves.

Guide curves should be a higher-level concept. All fibers should have their
own curve control points, with subdivision on the GPU.

Merge branch 'hair_guides' into hair_guides_grooming

Generic modifier copy already deletes target data, explicit freeing is redundant.

Rename the fur modifier to hair modifier.

Enable groom drawing in forward shading of the workbench engine.

Normal calculation for groom hull.

Enable faces for the groom bundle hull and fix index counts.

Enable shaded surface drawing for groom objects.