Blender Git Loki

Fix T62749: random mesh selection crashes.

This was an off-by-one error in the initialization of tbuf, but refactored the
code a bit more to be less obscure.

Fix: Make sure color panels only appear in modes where they are supported

UI: Rename GPencil Brush 'Appearance' panel to 'Display'

Makes it consistent with other paint modes

Fix: Color Picker and Color Palette panels were appearing for non-color tools in Vertex Paint mode

Use correct poll method for both modes

Cleanup: fix debug warnign due to tooltip ending in dot.

UI: Make Brush Display panel consistent between Image Editor and 3D View texture painting

-Slightly simplify in both places too

Merge branch 'blender2.7'

UI: Remove redundant separator

UI: Make Stroke panel consistent between Image Editor and 3D View texture painting

This should probably become de-duplicated, but at least they look consistent now

Fix: own wrong path to image paint tool settings in recent commit

Cycles: add cycles.merge_images operator for combing EXR renders.

This is only available through the API, mainly intended for render farms to
combine rendered multilayer EXR Files with different samples. The images are
currently expected to have the exact same render layers and passes, just with
different samples.

Variance passes are still simply a weighted average, ideally these should be
merged more intelligently.

Differential Revision: https://developer.blender.org/D4554

UI: Re-organize Brush Properties

- Consolidate each brush section (Color, Palette, Gradient) and make them distinct
- Remove the lock icons and move these items into an Options sub-panel, together with other toggles
- They now have more descriptive names
- Use an enum for view vs scene brush unit
- Use Property Split layout and sub-panels in line with the rest of 2.8
- Rename Curve panel to Falloff

Reviewed by: campbellbarton, pablovazquez

Maniphest Tasks: D4529

Differential Revision: https://developer.blender.org/D4529

Units: Use PROP_PIXEL for grad_spacing

Cycles: Implement function to format and parse human readable time

Gives value in seconds for a string which is encoded in format HH:MM:SS.hh.

Fix: Add poll methods for quick effects operators

Differential Revision: https://developer.blender.org/D4259

Cleanup: correct comment

decision id cleanup

UI: scale cursor motion threshold by DPI

This was using hard coded values of 2-3px.

Move both drag and motion thresholds to defines.

Fix T60684 Fourth and subsequent vertex color / UV layers displayed black

Merge branch 'master' into greasepencil-object