Blender Git Loki

Merge branch 'greasepencil-object' into temp-greasepencil-vfx

Merge branch 'blender2.8' into greasepencil-object

WIP: Add new blur parameter for Rim FX

Still is not working, this commit only put the pieces in place.

Merge branch 'hair_guides' into tmp_hair_curves

Merge branch 'hair_guides' into hair_guides_grooming

Merge branch 'blender2.8' into hair_guides

Construct hair strands data from hair systems (no real UV/MCol yet).

Extend default material function for Eevee to work with hair systems.

GP UI: Make the "Grease Pencil Paper" panel/options part of the Overlays popover

This is a special feature only used during Draw Mode, and functionally
acts like an overlay. Some cleanups/tweaks to this are needed still,
but it's good to get it out of the way.

Cleanup: Variable Naming

Merge branch 'blender2.8' into greasepencil-object

# Conflicts:
# release/scripts/startup/bl_ui/space_view3d.py

Fix for py errors in console, caused by bad poll callback for the "Animation" panel

Fix: Ensure correct names when using the "New Layer" operator for GP Object and Annotations

This replaces what 7931a1357a0f93ac0d7b8e6a564faa0b735a96ff
tried to do. We may still need to make these separate operators
to simplify things even further.

GP Object: Don't show Add/Unlink datablock buttons for GP datablock ID selector

These buttons are not shown for any other object type,
so these shouldn't be shown for Grease Pencil objects.

Revert "Add annotation layer with the right name"

This reverts commit 7931a1357a0f93ac0d7b8e6a564faa0b735a96ff.

Merge branch 'blender2.8' into temp-tab_drag_drop

Cleanup: Refactor button-group code

* Split generic button-group code from specific application
* Move button-group API to interface.c.
* Avoid struct abuse by using wrapper structs
* Naming, comments, etc.

Remove Animdata update for Palettes

This datablock is not animatable.

Remove Animdata update for Palettes

This datablock is not animatable.

Change parameter type for poll funcs after merge