Blender Git Loki

Guarded allocator: Add explicit switch to the lockfree implementation

Previously the only way to use lockfree implementation was to start
executable and never switch to guarded allocator.

Surely, it is not possible to switch implementation once any allocation
did happen, but some tests are desired to test lock-free implementation
of the allocator. Those tests did not operate properly because the main
entry point of tests are forcing guarded allocator to help catching
bugs.

This change makes it possible for those tests to ensure they do operate
on lock-free implementation.

There is no functional changes here, preparing boilerplate for an
upcoming work on the allocator tests themselves.

GPencil: Keep Libharu disabled for now

Geometry Nodes - Internal rename + API change: NODES for anything but UI

Most of the times the nodes will be non-empty. Empty is really only what
shows in the UI.

Fix lost node links when linked node group datablock is temporarily missing

Don't refresh the list of sockets, so that when the .blend file is restored the
links remain valid. Also display such nodes in red to indicate an error, same
as when the node type info is missing.

Merge branch 'blender-v2.91-release'

Fix T82540: Smart UV project ignores seams

The seam check was missed in 9296ba867462f7ff3c55bc0c9129af4121243bed
which calculates islands from the BMesh.

GPencil: Avoid calculation of transform matrix for each stroke

GPencil: Add a ToDo

GPencil: Include Scale parameter

GPencil: Add resolution parameter

GPencil: Apply target object

Also added rotation of the strokes

GPencil: Move points to new origin in center of the strokes

GPencil: Basic export working

Still need to recenter the imported data

GPencil: Publish in RNA fill_opacity_fac

GPencil: More test with SVG

GPencil: Free memory

GPencil: Basic structure of import

Still pending the stroke creation

GPencil: Cleanup variable names for non public variables

GPencil: Basic structure of Import SVG in place

Actually the code does nothing, just call the function, but the menus and operators are in place.

GPencil: Move libharu to lib folder

This library will be used to export PDF