Blender Git Loki

Volume object datablock skeleton code.

This only adds Shift+A > Volume object and displays a list of grid names
in a specified VDB file. Branch pushed for reference if someone other than
me wants to pick up this project.

Merge branch 'blender2.8' into greasepencil-object

Conflicts:
source/blender/draw/modes/object_mode.c

Invert thumbnail switch to make UI more consistent

Also changed icon.

Visual Studio compile fixes

Add delete button to Color Preview list

This makes the control more consistent and avoid flickering when change list mode.

File RW OK

UI: Replace color by material previews in list

To make more consistent the UI, the list of colors must shows the preview, not the old color boxes.

Besides, the new materials are more complex that a simple color box and the image was not representative.

Merge branch 'master' of git.blender.org:blender into cycles_embree

# Conflicts:
# intern/cycles/blender/addon/properties.py

Merge branch 'blender2.8' into greasepencil-object

Cleanup and bug fixes.

Use live icons to template_ID for graese pencil materials

Add new parameter to template_ID to use live icon in button

By default, the button uses a predefined fixed icon, but in some situations it's better to show the preview (materials)

update to new OSD API again

Update to new OSD blender API

Fixed camera object tranformation matrix

Make vertex wig sampling reflect the method in the paper

Added time reporting and optimized osd_eval creation

Initial port to 2.8

Remove console warnings for tool bar

This will chanage in the future, but we can keep running without warnings with the current implementation.

Update Icon for materials when change something

Need update icon for compact list. becaus ethe thumbnail is not used.