* [Dialogue] Add support for Dialogue Window buttons.
- Also changes "mysterious" identifier to "{mysterious}".
- Both button names are required for anything to show up, otherwise it defaults to Yes/No similar to Client::SendFullPopup.
* Move SetEntityVariable so responses can override default button response.
* Add negativeid support so you can override button two popup ID.
* Fix log.
* Update dialogue_window.cpp
Convert button names to strings and negativeid to secondrespondid.
