Take topicdata() and formatmap() out of the queue

[jpmens]

topic processing and format functions are done in the job queue, i.e. they're invoked N times if a message has N targets.

Pull those up and invoke before the job is added to the queue.

Simultaneously, attempt to parse JSON from payload BEFORE the filter() function is invoked, and pass data{} to it as well. (Doesn't cost more, and adds functionality.) In order to not break existing filter(), add data=None to end of call.

[jpmens]

Addressed in #169

[amotl]

The first part "Pull those up and invoke before the job is added to the queue" in fact is addressed and resolved, that's true. Don't know about the "attempt to parse JSON from payload BEFORE the filter() function is invoked, and pass data{} to it as well" part, though, since we're not yet into filtering. Please check.