Blender Git Loki

LANPR: Fix background color.

LANPR: Rename Freestyle face/edge mark structures into LANPR.

Cleanup: Remove obsolete lanpr_access.h

Cleanup: lanpr operator py script.

Cleanup: make format.

Cleanup: Remove LANPR from editor CMakeLists.

Cleanup: Remove random useless files.

Cleanup: Remove obsolete LANPR includes from CMakeLists

Merge remote-tracking branch 'origin/master' into soc-2019-npr

Outliner: invisible object filter

Adds an invisible object filter in the outliner to show hidden
objects. This is useful to quickly locate hidden items in a large outliner
tree and easily toggle visibilty back on. Invisible refers to an object
being hidden, or viewport visibility restricted.

Merge branch 'master' into soc-2019-outliner

Merge branch 'master' into temp-soc-2019-outliner-sync

Outliner: Allow select on row icons

Allow selection of subtree elements on a collapsed element's
row. Because subtree elements are aggregated by type, a select on
an icon that represents multiple subtree elements will invoke a
popup menu to select the specific subtree element.

Also draws highlights on cursor hover over a row icon.

UI: Sculpt menus cleanup

This removes the Brush pulldown menu from Sculpt and Paint modes. This menu only contained a random duplicated subset of brush options. Now everything is accessible centrally in the Brush Tool Settings.

The Sculpt menu likewise contained various random brush options. These are removed and replaced by a list of commands, just like the other paint modes.

Also removes the Show Mask option from the mode options panel since this is also in Overlays.

Reviewers: Campbell Barton

Differential Revision: https://developer.blender.org/D5420

Cleanup: use doxy docs

Don't swap buffers of offscreen surface OpenGL contexts

This does frame syncing to the regular screen, so hurts performance in
some cases.

Cleanup: versioning comment for outliner syncing

Initial D5423 (by @howardt)

Outliner: Draw constraint icons and enable button

Draw all constraint icons and enable/disable restrict buttons.

The action constraint needs its own icon. It currently draws white
instead of the blue modifier color.

BMesh: add utility to calculate normal from a vertex cloud

Extract from BM_verts_sort_radial_plane & simplify.