new feature: defstruct clause macros.

* lisplib.c (struct_set_entries): Trigger autoload on new
symbols define-struct-clause and *struct-clause-expander*.

* stdlib/struct.tl (*struct-clause-expander*): New variable.
(defstruct): expand-slot local function now returns list of
expanded slots, not a single slot; every case in the tree-case
is converted to return a list. The syntax of a slot clause is
first expanded through *struct-clause-expander hash; if that
works then the resulting list is further scanned for
expansions.
(define-struct-clause): New macro.
(:delegate): New struct clause defined with
define-struct-clause. Provides single-slot delegation.

* tests/012/oop.tl: Tests for :delegate.

* txr.1: Documented define-struct-clause and :delegate.

* stdlib/doc-syms.tl: Updated.

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