Also allow custom false and null when serializing to JSON

* doc/lispref/text.texi (Parsing JSON): Describe new arguments of
json-serialize and json-insert.

* src/json.c (enum json_object_type, struct json_configuration):
Move up in file before first usage.
(lisp_to_json_toplevel, lisp_to_json_toplevel_1, lisp_to_json):
Take a json_configuration.
(Fjson_serialize, Fjson_insert): Take multiple args.
(json_parse_args): Take new boolean configure_object_type.

* test/src/json-tests.el
(json-parse-with-custom-null-and-false-objects): Add assertions fo
json-serialize.

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