Blender Git Loki

Fix "make update" on macOS/Linux not updating addons to the blender2.8 branch.

This will need to be removed once we merge into master.

Fix wrong grease pencil modifier show viewport/render icons.

UI: update Cycles passes panel for single column.

Merge branch 'master' into blender2.8

GP: Back Stroke projection mode

Back the old 2.7x stroke mode when drawing. This mode try to project the new strokes over the previous strokes.

GP: Cleanup unused

GPU: Extend mac blitting workaround to AMD Radeon R9 familly

Fix build error on Windows 32bit, alignment was wrong.

Add 'O' for Overrides to our key-coded ID UI-names generator.

Add library-hint to datablock search menus.

We had those for ID templates, but it's also tremendously useful for
regular ID pointers UI, since often you can get local and linked
data-block with same exact name...

Fetaure request from Spring team (and long due TODO...).

GPU: Fix faulty mac gpu detection

PyAPI: Use 'None' arg to clear header text

PyAPI: Support for 'None' string args from Python

This is needed because some RNA functions differentiate a NULL 'char *'
argument from an empty string.

Previously a NULL argument could be passed when the C definition
defined the default as NULL and the argument wasn't passed
which is a fairly hidden way of handling things.

Now strings use `PROP_NEVER_NULL` by default
which can be cleared for function arguments that allow None -> NULL.

Multi-Object EditMode: curve delete

D3859 by @zazizizou

Sequencer: replace notifier /w message-bus

Cleanup: keep RNA types sorted

Fix memory leak in workspace menu

UI: add uiItemMenuFN which frees it's argument

UI: add uiItemMenuFN which frees it's argument

Fix crash adding workspace