Blender Git Loki

Merge branch 'blender2.8' into hair_guides

Add missing context mode string for groom edit mode.

Static assert for correct strings from context mode enum.

Adding new context modes requires adding a string in CTX_data_mode_string,
but there is no error when omitting this other than panels using
incorrect contexts. The static assert should help detect simple
missing strings at least to avoid confusing errors.

Add missing switch break.

No effect so far for subsequent code.

Merge branch 'blender2.8' into hair_guides

Add missing editmode menu for groom objects.

Use derivedFinal as scalp surface (for the time being).

Eventually DerivedMesh will be deprecated and Mesh used instead,
but until then the surface sampling algorithms use DerivedMesh.

New object pointer in groom ID to use as a "scalp" object for attaching hair.

RNA and UI scripts for the hair system and draw settings in groom objects.

Add a hair system in the groom ID block for creating renderable hairs.

Fix transform recalc, 2D data only exists for section vertex transforms.

Transform operator support for groom vertices.

Some tentative iterator macros for groom data.

Circle select implementation for groom objects.

Box select implementation for groom objects.

Lasso select implementation for groom object.

Use a secondary cache for interpolated shape loops.

Mouse-picking operator for groom vertex selection.

Curve cache for main groom bundle curves.

This stores interpolated cubic spline values for smooth curve rendering.
Local coordinate frames for sections are also computed alongside the cache.

Add UI script for groom data.