- Rename `chatRoomOpened` event to `chatRoomViewInitialized`
- Rename `chatBoxInitialized` to `chatBoxViewInitialized` and trigger only for `ChatBoxView` instances.
- New event `headlinesBoxViewInitialized`
- Trigger the `chatBoxInitialized` event when a new `_converse.ChatBox` is opened.
- Move headless one-on-one chat functionality into converse-chat
- Split converse-headline into converse-headlines and converse-headlines-views
- Add api in `_converse.api.chatboxes` for creating chatboxes
- Add `_converse.api.controlbox.get` method