New sequence building framework.

Just as the "seq_iter" iterators help to condense
the code for iterating any kind of sequence, "seq_builder"
objects solve the problem of producing a sequence of the
same kind as an input sequence.

Until now, two approaches have been taken for this. One
was to have separately coded cases: code iterating over
a string building up a string, and so on. The other has
been to produce a list, which is then coerced to the
right sequence type using make_like.

The approach introduced here is similar to using
make_like, but without wastefully consing up a temporary
list.

The remove-if, remqual, remql, remq and keep-if functions
are retargetted to this new abstraction.

* lib.h (struct seq_build, seq_build_t): New struct type.
(struct seq_build_ops): New struct type.
(seq_build_ops_init): New macro.
(seq_build_init, seq_add, seq_pend, seq_finish): Functions
declared.

* lib.c (seq_build_generic_pend, seq_build_obj_mark,
seq_build_struct_mark, seq_build_carray_mark,
seq_build_vec_add, seq_build_str_add, seq_build_buf_add,
seq_build_buf_pend, seq_build_buf_finish, seq_build_list_add,
seq_build_list_finish, seq_build_struct_finish,
seq_build_carray_finish): New static functions.
(sb_vec_ops, sb_str_ops, sb_buf_ops, sb_struct_ops,
sb_carray_ops, sb_list_ops): New static structs.
(seq_build_init, seq_add, seq_pend, seq_finish): New
functions.
(rem_impl, rem_if_impl): Reworked in terms of seq_iter
and seq_build, becoming much shorter, and handling all
iterable objects.

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