Blender Git Loki

GP: Move Solo Mode to Layer level

WIP: Still pending the final UI location and name.

GP: Speed Guides: Add object reference option

+ Reference point has three options, cursor, custom and object location

Also based on feedback from @pepeland
+ Remove preset angle buttons from UI
+ Make 3d cursor default reference point
+ UI tidying
+ Fix interpolation on circles. This is determined by brush samples option but for Circle guides this option is overridden.

Fix T60213: crash loading .blend file with material override.

UI: tweaks to user preferences layout.

* Expand more sub-panels by default.
* Move release confirms and numeric input settings to Input.
* Move 3D cursor settings to Editing.
* Move region overlap to Interface.

Cleanup: add trailing commas to structs

Needed for clang formatting to workaround bug/limit, see: T53211

object.dimensions: add warning about multiple consecutive assignments.

Since this is API-only prop now, it's worth warning about that
limitation.

Follow-up to comments in rB9c928bb93e04.

Fix T60187: Latest couple of builds fail to run, need libGLX.so.0

allow passing node itself into the execution function

UI: tweak preferences

- Move author to save&load
(was incorrectly under text editor).
- Rename Memory -> Memory/Limits
(some of the settings aren't obviously todo with memory).

Cleanup: style, line length

GP: Speed Guides: Fix bug in event handling

+ Minor edits

GP: Paint: Guides add snap distance to Parallel mode

GP: Paint: Speedline Guides

+ OKEY sets current reference point including 3dcursor
+ Tidy logic in draw utils (suggested by Antonioya)
+ New operator GPENCIL_OT_guide_rotate to set angle from UI
+ Tidy up UI panel with alternative to flip option
+ Angle for snap and parallel lines is now separate

Known Issues:
Some missing UI updates. Probably missing a notification somewhere.

fix T59743: Collada exporter: Add option for exporting flat curves

The Collada exporter suppresses the export of flat animation curves
to optimize the animation (in fact to make the exported file smaller).

But sometimes it is important to also have the flat curves exported
because they may be needed to define an initial transformation to
a fixed location - like translating the weapon from the ground floor
to the back of the model in the report.

I added a new option "all keyed curves" which is disabled by default
but when enabled it also exports flat curves.

feedback is very welcome

Merge branch 'greasepencil-object' into greasepencil-experimental

Correct version patching of Preferences theme

In a77b63c56943eb, the Preferences navigation region background was
made brighter. Recently stored userpref.blends (since b00963afc14978b,
so beta release included) would still use the slightly darker
background for the Preferences navigation region.
Now the version patch added for a77b63c56943eb also sets the new color
for those recent configs.

GP: New Solo Mode to display keyframes only

When paint mode, now is possible display only layers with keyframes in the current frame.

This is very useful to fill strokes.

Merge branch 'master' into greasepencil-object

fix T60092 collada exporter: exporting a rig with one single bone fails

The problem was that removing entries from a vetor while iterating
the vector was implemented badly. This caused the failure when only
one element was in vector.

Merge branch 'greasepencil-object' into greasepencil-experimental

# Conflicts:
# release/scripts/startup/bl_ui/space_toolsystem_toolbar.py
# release/scripts/startup/bl_ui/space_topbar.py
# source/blender/blenloader/intern/versioning_280.c
# source/blender/makesrna/intern/rna_sculpt_paint.c