Migrate to on_message(), expand handlers
Migrate to on_message(), expand handlers

* Move away from the custom `message()` method - and use the built-in `on_message()` event handler to allow pings
* Add `mvresponse` to allow reordering of the response list (as they're iterated in order and only the first match is evaluated)
* Add `chkresponse` to allow testing for matches and give a breakdown of response info
* Add `editresponse` to update regex triggers of existing responses by index
corpnewt/CorpBot.py,corpnewt/CorpBot.py