This prevents it from being persisted across page loads and makes more
sense logically.
Also move markScrolled to utils and MUC unread messages indicator to bottom panel.
Instead of on the views/components.
We still have `close` methods on the components, but they are just
event handlers and not external API methods to be called by other code.
Instead `close` should be called on the model.
This is largely a leftover from the Backbone.View days and makes less
sense now that the UI is componentized.
Ideally we don't want to call commands on the "views themselves, instead
we should be working on the the models and let the "views" update
themselves automatically.
Also, given that the `jid` attribute on the chat views might change,
especially when rendered declaratively in other frameworks like React,
a view might not be available at times where we previously might have
expected it to be (since it's been repurposed for a different JID).
Previously they were of type ElementView from @converse/skeletor
The ElementView component is merely a helper to allow us to eventually
migrate everything to Lit
More work on making bottom panel sub-components declarative
- Handle auto-completion in the converse-muc-message-form element
- Make message limit indicator a component
- Rename template
- Move `showModeratorToolsModal` method from view to utils
- Move `getNicknameRequiredTemplate` method from view to utils
- Move common `close` code to base class
