For now everything should look identical. However this moves to using a model for the content of the message and is intended to lay the foundation for improved message content representation, e.g. splitting up a text message in multiple sections and using different delegates for things like code and quotes.
Get rid of the anchors and move to layouts for th bubble and avatars.
This allows the timestamp to be fixed in compact mode so it always sits on the far right. It's also just now more compact than before.
Make sure that message delegates are getting the room object directly rather than requiring the assumption that currentRoom is declared somewhere higher up.
This MR deals with only sending threaded messages. Showing threads will turn up in a follow up. This allows you to start a new thread by clicking reply in thread to a normal message.
You can also do a threaded reply to a threaded message in the main timeline at the moment because those messages aren't shown in a separate thread timeline yet but will be in future.
