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GP: Change icon identfier for shaderFx

This commit complements commit d2ad256326736c8a4c746163f9b27491d8a6e95a

UI: remove context path from tool settings tab in properties editor.

UI: add dedicated icon IDs for decorators, tool settings, shaderfx, overlays.

The preset and decorator icons were updated to be monochrome and draw in the
same color as text. Other icons are unchanged, having them as separate icon IDs
prepares for an artist to make them.

Merge branch 'master' into blender2.8

Cycles: Cleanup, whitespace after keyword

Cleanup: Improve comments

GP: Fix unreported surface missing strokes

When drawing in surface mode if the stroke z-depth was not valid, the stroke was created, but it was not visible because location was something illogical.

Now, if the z-depth cannot be calculated, the stroke is calculated as it was done in other modes.

Workspaces: switch object mode when switching workspaces.

In the workspace properties a mode can now be configured that is
automatically enabled when switching to the workspace.

This is a test to validate how well it works. The weak point is
that if you don't have an appropriate object already select it will
not switch modes.

See T56475.

Merge branch 'blender2.8' into greasepencil-object

Fix fox strict flags: Avoid sign cast of strlen() result

Merge branch 'master' into blender2.8

Buildbot: Correction to previous commit

Buildbot: Attempt to fix glibc-2.19 compilation

It is likely to be retired, but for until then lets ensure it works.

Merge branch 'master' into blender2.8

Outliner: support dragging multiple collections, same as objects.

GP: Undo previous Subdivide edit operator and reformat code

The previous commit reusing the subdivide modifier code was not taking in account the selected points, so the subdivide was wrong.

Cycles: Fix detection of CPU brand string on 32 bit platforms

The assembler template was backing up and restoring ebx, which is
fair enough. However, this did not prevent compiler for putting
result variables to ebx. This was causing data corruption.

In order to prevent this easiest solution is to list ebx in clobbers
for the assembly.

UI: check prop-separate before adding black decorator

This caused the blank icon to be added to menus (ndof menu for eg).

Cleanup: warnings