- No need to create a new storage mechanism, just use `persistent`.
- Store SCRAM keys per JID
- Upon succesfull login, store the current session JID, so that we know who to fetch SCRAM keys for
- Only store SCRAM keys when the device is trusted
Fixes#3001
It's now necessary to add a `converse-root` element in the DOM where you
want Converse to render (previously it was any element with the id
`#conversejs`).
Also, turned `converse-chats` element into a Lit element and re-render
`converse-root` and `converse-chats` when the `view-mode` or `singleton`
settings change. This is a step towards being able to change the view
mode on the fly and have the entire chat re-render appropriately.
Fixes#2647
