Improve retarget auto-mapping algorithm #81843
Merged
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In some cases, the model does not have Hips and Neck, but only a spine, as in the case of bones created with Blender's rigify.
The current auto-mapping requires Hips as a prerequisite, and if Hips cannot be guessed, everything fails. So this fix make it search for Hips candidates with "Spine" as the word with the lowest priority.
Also, make the Neck mapping be done after the Shoulder mapping. This will make sure that the Neck is guessed child of bone which the parent of the shoulder (or hand) cross with having "spine" name.