At its best, this worked ok-ish, though it was always missing basic features.
It's also a massive memory leak and significantly complicates the codebase.
(Which is not yet cleaned up by this commit)
Currently, it is entirely broken and noone noticed or cared enough to report or fix that.
BUG: 455984
When curtain user is spamming a lot of messages in a short amount
of time, mod need to scroll all the way up to the first spam message to
know who send those spam message, thus start banning them.
This patch add a context menu to open the sender detail dialog, it could
make banning the spam user and batch-deleting spam messages easier.
Move the itinerary model representation to it's own component and instantiate from MessageComponentModel. This starts to lay some groundwork for previewing other files.
Make sure that the new rules for counting notifications for muted, mention and low priority rooms is applied consistently to the room list, space drawer and the task manager notification badge
implements #644
Change the LastActivity sort order to Activity and update to a more flexible way of sorting based on an order from model roles.
Add options to actually switch between Alphabetical and Activity
Based on some old work by @tdfischer
implements #103
The aim is to be able to use separate delegate for things like codeblocks and quotes so that they can be styled differently.

Currently the ability to reply in threads was added but not the ability to actually view threads so this doesn't currently make much sense to just have enabled int he main build.
Note: I want to cherrypick this so it's just the flag. I'll add a feature flag page to dev tools for master soon.
Currently, this is only to pause playback of other media when something new starts playing.
In the future, it will also be used for other things, like call ringing, etc.