Blender Git Loki

Fixup in doversioning

Integrated MBC functions. Added Object centers and empties.

Remove unused panels (layer_passes and layer_options)

Add scene active layer

Remove scene layer and collection from context

Merge branch 'render-layers' of git.blender.org:blender into clay-engine

# Conflicts:
# source/blender/editors/space_view3d/drawobject.c

Fix compile error

Merge remote-tracking branch 'origin/blender2.8' into render-layers

Clay Material work.

Merge remote-tracking branch 'origin/blender2.8' into render-layers

Initial support of Uniform Buffer objects

Removed Batch storage
Also lots of renaming
Small visual tweaks
Material Settings Struct is now shared by Scene and material

curve convert and mesh separation working

Refactor mball util function, untested

I have not address MBalls directly, so there are probably other parts that are required to conform to the new code before consider than useful

unittest: bpy.ops.object.duplicate

Handle main object dupli functions

Missing: mesh separation, material split, mesh conversion (curve to mesh)

I hereby declare layers syncing fully implemented!

Use more of the FOREACH macros in screen_context.c

object/base iterator refactor + add FOREACH_VISIBLE_BASE

Using static for prototypes