Blender Git Loki

Implement cloth trouble indication map

This allows one to set a vertex group, to which "trouble" data is
written. This allows one to see where issues occured for instance in the
event of a cloth explosion.

Add support for cyclic stroke

Cleanup: Rename screen var and change culling factor

Merge remote-tracking branch 'origin/blender2.8' into temp-depsgraph-layers

Add stroke culling to avoid weird lines

Change stroke scale

Merge branch 'blender2.8' into gpencil_2.8

Updated copyright for the new files.

Switched from multiplication of base and subsurface color to blending
between them using the subsurface parameter.

Merge branch 'master' into datablock_idprops

Fix always-unlinking in ID free function.

Since IDProps now handle ID usages, makes sense to pass do_id_user flag
to some new IDP_FreeProperty_ex() as well...

Merge branch 'blender2.8' into custom-manipulators

Merge branch 'blender2.8' into custom-manipulators

Merge branch 'blender2.8' into custom-manipulators

remove correspondence struct on the blender side accordingly

Merge branch 'blender2.8' into custom-manipulators

the first revision according to D2570

Rename editors/workspace back to editors/screen

We'll keep the name 'screen' to describe everything visible within the
window, including the global bars (top bar, status bar) which are not
part of bScreen struct (which describes the customizable screen-layout).
It's quite confusing to have the term 'screen' used for bScreen
operations too, but plan is to get rid of bScreen and move its data to
WorkSpace and WorkSpaceLayout (could be called ScreenLayout then).

Fix incorrect operator name

Cycles Denoising: Remove a few unused utility functions