Implement dual quaternion linear blending (DLB) #44
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Simple and fast interpolation, generalization of QLB (quaternion linear blending).
While ScLERP has the nice properties of constant speed, coordinate system invariance, and is shortest path, DLB is only coordinate system invariant and shortest path (not constant speed). (*)
TODO
(*) see Dual Quaternions for Rigid Transformation Blending by Kavan et al.