Add stubs to JsonParser for actually parsing a JSON stream

Initial commit for getting JsonParser to work. Because GScanner API
is old and mostly sucks, we need to do some magic with signals.

If json_parser_load_from_data() fails, the passed GError will be set
with a JSON_PARSER_ERROR code and message; unfortunately, we can't get
the nice error message out of GScanner. We can, however, override the
default message handler and make it emit a signal on the JsonParser
object.

So, to make a long story short: the GError passed to the load_from_data()
method is filled with a short error message; the *real* error message
is passed to the ::error signal handlers so they can actually use it.

GScanner should really get a way to retrieve the last error message.

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