7cd3f2aabb
Refactor to prepare for slotted action support to the evaluation of quaternion F-Curves. Since slotted Actions store F-Curves in an array, you cannot iterate over them any more via the `ListBase` pointer `fcurve.next`. Quaternion evaluation code has been refactored to work on a span of F-Curves instead of just getting the first one. For now, slotted Actions just evaluate their first slot only. A future commit will add a slot handle parameter to evaluate the correct slot.
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