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Nodes: String to Curve, Value to String, String Join, String Substring, String Length

This patch adds a node that generates a curve from entered text or String Input.
It also adds some helper nodes (value to string, join, substring, length)

{F10163233}

Fix T88807: crash when there are multiple links between the same sockets

This commit does two things:

* Disallows creating more than one link from one socket to a multi socket input.
* Properly count links if there happen to be more than one link between the same sockets.

The new link counting should also be more efficient asymptotically.

Differential Revision: https://developer.blender.org/D11570

Revert "Nodes: String to Curve, Value to String, String Join, String Substring, String Length"

This reverts commit 1aaf6f4a1d79ffb1199f0b8f76d9d8240daa36cc.

Nodes: String to Curve, Value to String, String Join, String Substring, String Length

This patch adds a node that generates a curve from entered text or String Input.
It also adds some helper nodes (value to string, join, substring, length)

{F10163233}

Merge remote-tracking branch 'origin/master' into experimental-build

Merge remote-tracking branch 'origin/master' into temp-lineart-contained

WIP: Geometry Nodes: Support nodes modifier on curve objects

With this commit, curve objects support the nodes modifier. The goal is
that nodes modifiers will read curve data as the original curve, unless
they are placed after a modifier that must tessalate the curve (convert
it to a mesh). Always converting to a mesh in that case is basically
just a formalization of the behavior that was already present after
recent fixes for 2.8 versions last year and two years ago. For more
controlled explicit conversions between data types, using geometry
nodes makes so much more sense anyway.

TODO:
- Add more code comments
- Fix memory leak(s?)
- Fix geometry components besides mesh don't display in viewport.

Differential Revision: https://developer.blender.org/D11597

USD import format fixes.

USD Import: Create Background Shader option.

Added option to convert USD dome lights to Blender world
materials.

Cleanup: Removed print statements used for debugging

Renamed file from editcurve_tool.c to editcurve_pen.c

Cleanup: Reduce indentation from redundant check

Cleanup: Order return argument last

Merge branch 'temp-geometry-nodes-curve-deform-node' of git.blender.org:blender into temp-geometry-nodes-curve-deform-node

Cleanup: Remove debug changes

Cleanup: Remove debug changes

Curve Deform Node: Refactor, add options, match modifier more closely

Merge branch 'master' into geometry-nodes-raycast

Adjustments to drag info drawing

* Change the "Add Named Object" drag into string to "Add Object". The "Named"
part is kinda useless info and relates to an implementation detail.
* Draw drag info closer to the cursor. Looked quite off before.

Support for single value input types.