Add the ability to send OMEMO corrections.
Refactor how OMEMO messages are sent to avoid having to override
`sendMessage` and thereby also allowing corrections of OMEMO messages to
be sent out.
Add two new hooks.
- getOutgoingMessageAttributes
- createMessageStanza
Trigger an `emojiSelected` event instead of manually calling `insertIntoTextArea` on the `converse-message-form` a component.
This loosens the coupling between the emoji picker and `converse-message-form`.
Call `disableArrowNavigation` when the emoji-picker is disconnected from
the DOM or when escape is pressed. See #2754
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