Blender Git Loki

Assorted Cleanup/Fixes

Annotations: Dynamically updating layer-color preview icons + "Active Note" enum

This adds a new enum with dynamically-generated icons to show previews
for the icons associated with each GP layer used for annotations. This
enum is used as part of the UI for annotations (specifically, in the
topbar settings for the active tool), making it easier for users to
see what color strokes drawn using the active note/layer will look like.

I ended up needing to create a new icon type in BKE_icons.h so that
we can store references to the layer/color used.

Known issues:
* The icon seems a bit too big, and would look a bit nicer with
rounded corners. But there are too many issues with the UI roundbox
functions (e.g. _aa() makes colors too dark, and non-aa versions look
too rough).

* Changing layer colors doesn't redraw the icons. A manual refresh
(by mousing over the widget) is needed.

Cleanup: Whitespace

Cleanup: Remove need to set colors on each and every annotation point when drawing

Fix duplicate Brush in tool bar

Merge branch 'blender2.8' into greasepencil-object

UI: Improve brush toolbar

This is a temp solution to show all brushes and sort by use, not alphabetical.

This will be replace when new tool bar system is in place.

Fix duplication error for Brushes

This produced an error when create a new brush and a memory leak when closed Blender.

Merge branch 'blender2.8' into greasepencil-object

Clenup: Remove old unused code

Merge branch 'blender2.8' into greasepencil-object

Merge branch 'blender2.8' into greasepencil-object

Merge branch 'blender2.8' into greasepencil-object

Merge branch 'blender2.8' into greasepencil-object

Revert temp fix for materials preview

Merge branch 'blender2.8' into greasepencil-object

Conflicts:
source/blender/editors/render/render_preview.c

Merge branch 'blender2.8' into greasepencil-object

Fix segment fault with material previews

This fix solves the issue with multiple previews at the same time. Maybe there wll be a more general solutions in render preview module, but we need keep the system running.

Merge branch 'blender2.8' into greasepencil-object

Remove unedeed flag in notifier