Blender Git Loki

Cleanup: rename "nested" to "embedded"

Reviewers: mont29

Differential Revision: https://developer.blender.org/D7476

Fix: Add extern "C" to RNA_enum_types.h

UI: Use different icon to remove user-created shortcuts in Preferences

There was no way for users to visually tell appart shortcut items
they've added themselves and the default ones. Both used the same 'x'
icon to remove the item.
Modified items already showed a back-arrow icon; this commit makes
user-created shortcuts use an icon that has both, a back-arrow and a
'x'.

The icon is in fact from the Movie Clip Editor, but William Reynish and
I concluded that it's not worth creating and adding a new one just to
short-term fix this small annoyance. And the icon actually fits the
purpose surprisingly well :) {F8485176}

Simulations: Add Boolean Math, Switch and Float Compare node UI

Reviewers: brecht

Differential Revision: https://developer.blender.org/D7424

Merge branch 'blender-v2.83-release'

Various typos fixes in UI messages.

Simulations: Use some shader nodes in simulation node trees

Reviewers: brecht

Differential Revision: https://developer.blender.org/D7422

Fix T75914: Assert Knife Tool

Actually the assert was incorrect. It tested for an active buffer, but
an batch would also be ok.

Simulations: UI for core particle nodes

This commit adds the initial set of particles nodes. These are fairly
low level and are expected to be put into groups that we ship with Blender.

See D7384 for a description of the individual nodes.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D7384

Nodes: Add emitters, events, forces and control flow socket types

These socket types will be necessary for particle nodes.
The way these sockets are drawn can be changed separately.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D7349

Nodes: New Object and Image socket types

Those new socket types will be necessary for particle nodes.

The main difficulty with adding these socket types is that they
are the first that reference ID data in their `value`.
Therefore, user counting code had to be added in a couple new places.

Reviewers: brecht, mont29

Differential Revision: https://developer.blender.org/D7347

Simulations: Embed simulation node tree in simulation data block

This adds an embedded node tree to the simulation data block dna.
The UI in the `Simulation Editor` has been updated to show a list
of simulation data blocks, instead of individual node trees.

The new `SpaceNodeEditor.simulation` property wraps the existing
`SpaceNodeEditor.id` property. It allows scripts to get and set
the simulation data block that is being edited.

Reviewers: brecht, mont29

Differential Revision: https://developer.blender.org/D7301

Merge branch 'master' into greasepencil-object

Cleanup: Remove unnecessary callbacks where default behavior is fine

See comments in D7225.

Cleanup: typo

Merge branch 'blender-v2.83-release'

Cleanup: ID management: Light ID type.

Keep IDType code at head of each ID file, instead of mixing it with more
specific API. Also do not define callbacks when defautl generic handling
is fine.

Fix T75922: Removing custom orientation doesn't update gizmo

Simulations: Add simulation node tree type

This implements a new builtin node tree type called `SimulationNodeTree`.
It is not yet embedded in the `Simulation` data block.

The node tree will initially be used for the new particle nodes system.

When the cmake option `WITH_NEW_SIMULATION_TYPE` is enabled, a new
`Simulation Editor` is shown in the editors menu (which is just a node editor).

This patch does not add entries to the Add Node menu, so it is empty.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D7287

Constraints UI: Layout tweaks

Increase consistency between constraints layouts.