• Render URLs in the timeline as clickable links (thanks to @MidhunSureshR, see #246)
• Rooms can left from the UI
• Left room are archived (and currently not accesible from the UI apart from through the URL, see #147)
• Archived rooms can be forgotten.
• Unread status doesn't affect the sorting position of a room in the room list anymore, to make rooms jump around less (see #347)