New #J syntax for JSON objects in TXR Lisp.

(needs buffer literal error message cleanup)

* parser.c (json_s): New symbol variable.
(is_balanced_line): Follow braces out of initial state.
This concession allows the listener to accept input
like #J{"a":"b"}.
(me_json): New static function (macro expander). The #J X
syntax produces a (json Y) form, with the JSON syntax X
translated to a Lisp object Y. If that is evaluated,
this macro translates it to (quote Y).
(parse_init): initialize json_s variable with interned symbol,
and register the json macro.

* parser.h (json_s): Declared.
(end_of_json): Declared.

* parser.l (num_esc): Treat u escape sequences in the same way
as x. This function can then be used for handling the \u
escapes in JSON string literals.
(DIG19, JNUM, JPUNC, NJPUNC): New lex named patterns.
(JSON, JLIT): New lex start conditions.
(grammar): Recognize #J syntax, mapping to HASH_J token,
which transitions into JSON start state.
In JSON start state, handle all the elements: numbers,
keywords, arrays and objects. Transition into JLIT state.
In JLIT start state, handle all the elements of JSON string
literals, including surrogate pair escapes.
JSON literals share the fallback {UANY} fallback patter with
other literals.
(end_of_jason): New function.

* parser.y (HASH_J, JSKW): New token symbols.
(json, json_val, json_vals, json_pairs): New nonterminal
symbols, and rules.
(i_expr, n_expr): Generate json nonterminal, to hook the
stuff into the grammar.
(yybadtoken): Handle JKSW and HASH_J tokens.

* lex.yy.c.shipped, y.tab.c.shipped, y.tab.h.shipped:
Updated.

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