Blender Git Loki

Merge remote-tracking branch 'remotes/origin/blender2.8' into soc-2018-npr

# Conflicts:
# source/blender/makesdna/DNA_scene_types.h

Correct doxygen file headers

Subdiv: Move mesh creation functionality to own header

Subdiv: Move evaluation functionality to own header

Subdiv: Move FOREACH functionality to own header

Subsurf: Clarify what Subdiv structure is for

Fix T56679: Blender 2.8 crashes with bezier curve snap.

Follow up to rB621b16468ef72fb actually... Seriously... :/

OpenSubdiv: Disable varying elements interpolation

We currently don't use those. Skipping creation of stencils for
them gives about 7% speedup of evaluation creation.

Cleanup: Typo in comment

UI: keep no-overlap tips open on cursor motion

Was causing flicker.

Cleanup: overly polite/rude messages

Fix error when no tool is active

Fix mistake in previous commit

Cleanup, indentation

Fix assert creating a tools tip

UI: support immediate non-overlapping tooltips

Use these for the toolbar, since they're non-overlapping the interface,
showing them quickly isn't a problem.

Merge branch 'master' into blender2.8

Cleanup: use const arg for BLI_rect inside check

Fix T56675: Crash when snapping Cursor to selected a Bone in Edit Mode.

Seriously...

Merge branch 'master' into blender2.8