read/get-json: reject trailing junk in string input.

* parser.c (lisp_parse_impl): If parsing from string, check
for trailing junk and diagnose. JSON parsing doesn't use
lookahead because it doesn't have a.b syntax, so the
recent_tok gives the last token that actually went into the
syntax, and not a lookahead token. So in the case of JSON,
we call yylex to see if there is any trailing token.

* tests/010/json.tl: Extend get-json tests to more kinds of
objects, and then replicate with trailing whitespace and
trailing junk to provide coverage for these cases.

* tests/012/parse.t: Slew of new read tests and iread also.

* txr.1: Documented.

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