Blender Git Loki

Fix build error on Linux / gcc

New branch to fix multires topology editing. WIP

Changes:
* Brought back bmesh_mdisps_space_set, written from scratch using
subdiv api, not ccg.
* Wrote a function to smooth multigres grids from within bmesh. I might
not need it; unless anyone thinks of a use for it I'll go ahead and
delete it.

Todo:
* Purge code of all usages of CCG for multires.

This commit:
* Wrote a utility function to dump multires displacements into a (new)
scene object.
* Consequently, I now know that the CCG_based multires code is not
compatible with the OpenSubdiv based code. The former produces gaps
between grids when converting displacements to object space.

USD importer: fixed traversal bug.

Changed prim traversal predicate to exclude inactive prims.

Merge branch 'master' into xr-actions-D9124

# Conflicts:
# source/blender/windowmanager/intern/wm_event_system.c

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-edit-curve

Remove more TM_elem_index_ensure calls that no longer are necessary

commit multires patch

Merge remote-tracking branch 'origin' into temp-trimesh-sculpt

XR: Add "selection eye" session setting

The "selection eye" is the XR eye (view) used for 3D-to-2D projection.
Its parameters are used to override the window view when selecting
with VR controllers.

Format fixes.

USD importer: fixed scene scaling.

USD importer xform bug fix.

Fixed matrix multiplication order when computing
local transform for merged objects.

commit before merging in recent master commits

Merge branch 'master' into greasepencil-object

Merge branch 'master' into greasepencil-edit-curve

LineArt: Clipped crease line does not show. Fixed.

LineArt: apply camera scale before matrix

Merge branch 'master' into soc-2020-io-performance

Merge remote-tracking branch 'origin/master' into lanpr-under-gp