Geometry Nodes: Rename Curve Parameter, Add Index on Spline

- Rename the Curve Parameter node to Spline Parameter.
  - Add "Index on Spline" to the node. This output is the index of
the current point on it's parent spline rather than the entrire curve.

Differential Revision: https://developer.blender.org/D13275

source/blender/blenloader/intern/versioning_common.h

@@ -64,6 +64,14 @@ void version_node_id(struct bNodeTree *ntree, const int node_type, const char *n
 
 void version_node_socket_id_delim(bNodeSocket *socket);
 
+struct bNodeSocket *version_node_add_socket_if_not_exist(struct bNodeTree *ntree,
+                                                         struct bNode *node,
+                                                         eNodeSocketInOut in_out,
+                                                         int type,
+                                                         int subtype,
+                                                         const char *identifier,
+                                                         const char *name);
+
 #ifdef __cplusplus
 }
 #endif