refset: implement objects that support car method.

refset and range assignment is implemented for objects that
have no lambda-set but do have a car method.

* lib.c (refset): Implementation for lists rewritten
to avoid listref_l, and use nthcdr instead.
For structs, if there is no lambda-set method, but
a car method exists, jump to the list case: the idea
is that we can cdr down and then use rplaca.
(dwim_set): Error handling streamlined. In this function too,
we check whether there is a car method and branch to the list
case.

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