Blender Git Loki

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.

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

Rename the fur modifier to hair modifier.

Merge branch 'blender2.8' into hair_guides

Merge branch 'blender2.8' into hair_guides

Merge branch 'blender2.8' into hair_guides

Merge branch 'blender2.8' into hair_guides

Backport hair drawing improvements and workbench support from the grooming branch.

Backport a few changes from the grooming branch.

material_index in hair system has been removed. The material/shader
for hair should be defined externally it doesn't make sense to rely
on the scalp object material slots for this.

Make the hair binding function more robust when no guide curves are defined.

Add missing include for mesh runtime.

Merge branch 'blender2.8' into hair_guides

Use common_view_lib.glsl instead of including the ProjectionMatrix uniform directly in hair shaders.

Fix hair fiber prepass shader and add missin HAIR_SHADER define to compile it.