[#690] Modify the 'cloneX' macro to only use 'dup's

Description

Problem: The current implementation of 'cloneX' is based on a recursive typeclass definition that uses 'dip's in its recursive step to prove constraints to the compiler. This is however very inefficient, because a combination of 'dup's would be enough otherwise.

Solution: modify the 'CloneX' type signature and family, to allow for 'dip's to be removed from its definition.

Related issue(s)

Resolves #690 (closed)

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