Geometry Nodes: Special string characters node

This patch adds a new node called "Special Characters" with two string
outputs: "Line Break" and "Tab". This is necessary because the newline
character cannot be easily typed with a keyboard, but is necessary for
the string to curve node.

Differential Revision: https://developer.blender.org/D12620

release/scripts/startup/nodeitems_builtins.py

@@ -606,6 +606,7 @@ geometry_node_categories = [
         NodeItem("FunctionNodeStringSubstring"),
         NodeItem("FunctionNodeValueToString"),
         NodeItem("GeometryNodeStringJoin"),
+        NodeItem("FunctionNodeInputSpecialCharacters"),
     ]),
     GeometryNodeCategory("GEO_UTILITIES", "Utilities", items=[
         NodeItem("ShaderNodeMapRange"),