Merge branch 'blender-v2.81-release'

Fix T70919: Proxies crash after building motion path

Was cause by recent fix for T65134 which assigned original object's
proxy_from to an evaluated pointer.

This is because motion path depsgraph does not include proxies, so
the pointer in an evaluated object was kept pointing to an original
object.

Fix T70740: Clicking on proxy bone makes original one jump to initial location

Caused by what appears to be a missing flush from evaluated bone back to
original, which then makes it so copy-on-write operation happening after
click (to synchronize selection flags) pushes original bone to its initial
position.

Differential Revision: https://developer.blender.org/D6051

Fix T70771: Texture nodes in Compositor causes infinite update

Cleanup: Fix naming of a function

Depsgraph: Don't use push-from-thread when scheduling graph

This isn't guaranteed that graph is scheduled from main thread,
so it is actually a miracle how it all worked.

Depsgraph: Cleanup, promote is_evaluating query

This way it might be used for sanity checks in RNA API as well.

Depsgraph: Inform when update or tag happens during evaluation

It is not allowed to do tagging or updates while dependency graph is
in the middle of evaluation.

This is something what is simple to violate from python code. This
change adds some sanity checks.

The request to update view layer or dependency graph will raise an
exception in Python now, so it's easy for scripters to notice.

Tagging for update will do silent return unless running with debug
command line argument. This is because it's a bit tricky to know
which exact dependency graph corresponds to a context from which
an update tag was triggered.

Differential Revision: https://developer.blender.org/D6035

Cleanup: Strict compiler warnings

CUDA Wrangler: Fix strict compiler warning

Namely addresses -Wstringop-truncation

Not sure if there is anything to be done for strncpy.

Differential Revision: https://developer.blender.org/D6006