- Use async/await instead of promises.
- Use different room jids (to try and see whether this fixes heisenbugs on travis)

updates #1209

fixes #1209

updates #1242

- No need for the `edited` event.
- Also, don't add load animation for MAM corrections

updates #1228

So that we first render dynamic content (e.g. images) before inserting
it into the chat.

Also, add the `show_images_inline` setting (which is the cause of this
whole change).

Updated tests to handle this new change and start using async/await
instead of promise callbacks.

updates #1228

updates #537

For example `This groupchat is not anonymous`

Mostly to match any previous leave/join message from the same user

Fixes #1062

And fix an HTML rendering bug for info messages and nicks that contain spaces

Previously we checked only if the last message was a join message from
the same person.

Now instead we check the last n messages that are join or leave
notifications.

* Don't show leave notification twice when someone leaves, joins and then leaves again
* Add a test case for a member joining and then leaving

Fixes #1169