Using unified COBJ representation for both regex kinds,

rather than the list-based notation for derivative-based
regexes, and an encapsulated COBJ for NFA-based regexes.

* lib.c (compiled_regex_s): Variable removed.
(obj_init): Initialization of compiled_regex_s removed.

* lib.h (compiled_regex_s): Declaration removed.

* regex.c (struct regex, regex_t): New type.
(regex_destroy): Object is now a regex_t, not nfa_t.
(regex_mark): New function.
(regex_obj_ops): Register regex_mark operation.
(reg_nullable, reg_derivative): Remove cases that handles
compiled_regex_s.
(regex_compile): Output of dv_compile_regex becomes
a cobj nwo. Output of nfa_compile_regex must be
embedded in regex_t structure.
(regexp): Drop the check for compiles_regex_s.
(regex_nfa): Function removed.
(regex_run, regex_machine_init): Use cobj_handle to retrieve regex_t *
pointer and dispatch appropriate code based on regex->kind.

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