- Modernize the `RegisterPanel` component and turn it into a Lit element.
- Improve CSS and move into plugin.
- Fix button click handler not being registered.
- Fix switching between login/register form after logging out (Fixes#1556)
Render the form based on `api.settings` instead of its own model.
When the login form is submitted, save the JID, password and connection
URL to `api.settings`.
Set the `service` on the Strophe connection object just before
connecting for the first time, otherwise a user supplied URL (via the
login form) is never used.
New API setting: show_connection_url_input
The eventual goal is to avoid UI-related stanza processing if the relevant chats
aren't in the DOM.
With the current architecture, chatboxes are created (and the stanzas
related to them processed) even if `#conversejs` isn't in the DOM.
* Initial work on making controlbox an element
* Create a shared base class
* Ceate ChatBoxViews proxy
* Update sass now that certain classes are moved to converse-chats element
