Blender Git Loki

UI: add weight paint sample tools

Also use unified weight.

Fix crash opening file saved in weight paint mode

Nodes: Remove workaround for action copy

Actions shouldn't be copying by new library management code.
Or at least should be possible to make it to not copy actions
or do unneeded user management.

This way we avoid modification of original data which could
and does cause threading conflict with copy-on-write which
could be happening for viewport.

Tool System: add paint poll which ignores the tool

Needed for tools which ensure paint context but aren't brushes
(color sample & gradient).

Tool System: support non-brush tools w/ paint modes

Allows select, gradient tools not to conflict with brush keymap.

Fix missing copy-on-write update when changing edit mode selection mode

Fix edit mesh selection with copy-on-write enabled

Merge branch 'blender2.8' of git.blender.org:blender into blender2.8

Workbench: Shading popover

- Moved random object color and object outline to shading popover as
these are draw options.

Fix crash opening files saved in sculpt/vertex paint modes

Skip access to any evaluated data when operator is run on file load,
we don't have depsgraph evaluated yet. In this case we skip part of
sculpt session initialization, since it will be done during depsgraph
evaluation which happens after DEG_on_visible_update().

We can not skip sculpt session initialization since during normal
operation we want all the data to be initialized on mode change,
and not on initial brush stroke.

Mark localized node trees and materials as such

Makes it easier to see where the datablock is coming from.

Depsgraph: Extra sanity checks for copy-on-write tagging

Depsgraph: Put original and evaluated ID node pointers to graphviz

Depsgraph: use human readable node type for graphviz debug output

Depsgraph: Cleanup, simplify operation code stringification

Depsgraph: Cleanup, remove unused code

Animation: Don't user-copunter copy-on-written action block

Icons: write object children

Allows for sharing geometry between icons.

Edit-Mesh: multi-object mark freestyle face

Freestyle face drawing is not working, but I tested it in 2.79, all good.

Edit Mesh: multi-object mark freestyle edge

Freestyle edge drawing is not working though.