And use it instead of listening to multiple Promises.

Promises get resolved once, which means using them doesn't work for
cases where the user logs out, and then in again (because the handlers
don't get called upon 2nd login).

regardless of wether it's a connection or reconnection event.

We can then only listen for `statusInitialized` to handle both cases.

Removed `_converse.chatboxviews.showChat` and trying to simplify how
chats are created and when they're shown.

Prompted by the work to split the MUC views into a separate plugin

- Remove undocumented and unused event `update-status-ui`
- Remove xhr_custom_status and xhr_custom_status_url options
- Use default value
- Remove unnecessary getter and setter

* Update jslicenses-inverse.html

* Update inverse.html

* Update index.html

* Update mobile.html

* Update anonymous.html

* Update CHANGES.md

It depends on `eval` which is unsafe.