since we create the `fetched` promise earlier

Fixes #2241

When we're showing only one chat at a time, we want to make sure that
all other chats have their `hidden` flag set to `true`.

Previously this was done in chatboxviews, but given that we want to
render UI based on state, this should be done in the headless part of
Converse.

As a result of the changes, the `beforeShowingChatView` has been
removed.

https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent/CustomEvent

In the process, turn it into a component

* keep message in place after edition by assigning previous message original timestamp
* update time displayed to keep current behaviour
* add test to check a message remains in the same position of the history after being edited
* briefly describe pr changes in changelog

- `allow_user_trust_override`
- `clear_cache_on_logout`

The `persistent_store` setting can now also be set to `sessionStorage`

The `trusted` settings was in effect playing the role of two separate settings
and implicitly affecting a third ('persistent_store').

By breaking it up, we make things more explicit and allow for new
configurations. For example, clearing the cache on logout, while using
some kind of persistent store.

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.2 to 6.5.3. **This update includes a security fix.**
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.2...v6.5.3)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

use muc-toolbar-btn-color for background

* allow the use of MUC affiliation, MUC role, and VCard roles as hats
* update setting documentation
* remove filter from VCard roles
* update naming and documentation to make explicit the use of XEP-317 Hats
* include muc_hats config option update to changelog

* notify changes to client on bookmark-update
* update XEP-115 caps verification string

in 1:1 chats.

See: https://xmpp.org/extensions/xep-0313.html#archives_id

* regression of #1317: Don't show errors for CSI messages
* fix failing tests

- Let `api.rooms.open` call `api.rooms.get` directly, instead of indirectly via `api.rooms.create`
- Remove the `createChatRoom` function
- Also strip URI parts from JID in `api.rooms.get` and use utility method for doing so

Bumps [http-proxy](https://github.com/http-party/node-http-proxy) from 1.18.0 to 1.18.1.
- [Release notes](https://github.com/http-party/node-http-proxy/releases)
- [Changelog](https://github.com/http-party/node-http-proxy/blob/master/CHANGELOG.md)
- [Commits](https://github.com/http-party/node-http-proxy/compare/1.18.0...1.18.1)
Signed-off-by: dependabot[bot] <support@github.com>

* #1829 css var instead of hard coded colors

Bumps [dot-prop](https://github.com/sindresorhus/dot-prop) from 4.2.0 to 4.2.1. **This update includes a security fix.**
- [Release notes](https://github.com/sindresorhus/dot-prop/releases)
- [Commits](https://github.com/sindresorhus/dot-prop/commits)
Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

* catch all whitespace characters instead of just new line

* Only update the room list after shown.bs.modal
* add changes to CHANGES.md
* Move shown listener to initialize