* Cleanup how we use message timeline items in preparation for rich reply rendering
* Expose reply details up to the UI level
* Render replies in the timeline (textual for now). Remove now unused AttributedStringBuilderComponent isReply flag.
* Move reply detail loading to when the item appears instead of when it's created.
* Fix unit tests
* Fetch event details also when the reply details are in the error state
* Tweaks following code review
* Localise emote bodies
* Fix replies not loading sometimes, use the current event identifier instead of the one being replied to
* Update snapshots.
* Fix timeline grouping and UI tests.
* Remove German UI tests with double-length pseudolanguage.
Avoids tests breaking when translations are updated.
