Blender Git Loki

Cleanup: use doxy grouping for view3d select

Easier to navigate, avoid mixing up functionality across the file.

Cleanup: style

Cleanup: replace ifdef w/ stub

Gizmo: multi-object pose-mode gizmo positioning

Gizmo: use general active center calculation

There are some minor differences in center calculation but I don't think
they're important, if so we can update the code.

- Edit-bone uses head (instead of the middle when both are selected).
- Edit-bone flag for restricting components uses the selection instead
of the active bone.

Cleanup: de-duplicate active item center access

probably it is not necessary to clear the cache on every rna property change

like changing autohide / automerge parameters which are considered live postprocess steps caused the mesh to disappear when not on cache startframe.

GP: Fix missing control points after merge 2.8

temporarily bringing back the legacy subsurf code for performance reasons

opensubdivs subdivision code has currently an abysmal performance and is thus not yet
really usable, especially with many ngons and variable topology in animations.
After opensubdivs performance issues have been fixed, this legacy code can go again.
Not before.

GP: Refactor reproject in primitives

re-added metaball remesher and deform motionblur in cycles for it and FM

Templates: remove redundant directory init

This is now handled when versioning all startups.

Fix building w/o bullet

Merge branch 'blender2.8' into greasepencil-object

Fix T59248: Crash in Grease Pencil Edit mode when adding Annotation

GP: Primitive: Change defaults

Based on User feedback from @mmendio.

The Arc tool now starts as a perfect arc in all directions.
The two control points for the Curve tool can be constrained to a single point using Shift.
Add Thickness profile to Box and Circle tools.

Fix (unreported) Broken rigidbody requirements when adding objects to a RB collection.

We have to ensure objects get expected RB data, when they are added to a
RB collection...

Fix T59208: Error when loading reference/background image in edit mode

GP: Primitive: Avoid duplicate point when adding new curves

added testwise threaded fracture via openmp

after more testing this might be converted to task, but works ok already, and added only
trivial changes to the code