Fixes#645
- Active space handling is moved from QML to RoomManager
- Active tab in SpaceDrawer (space / no space / DM) is unified in a single variable
- RoomList & RoomPage loading is simplified: We're always pushing a RoomPage now; if there is no room, a placeholder is shown
- SpaceHomePage is moved into RoomPage; This replaces the entire push/replace room/spacehome logic
- If the current room is a space, the space home is shown, otherwise the timeline
- The concept of "previous room" is removed entirely. If we're leaving the active room, the placeholder room page is shown
- When clicking on a space in the list, the space room list is switched and the space home page is shown
In short, these changes should (after some initial regressions) lead to a less crashy NeoChat :)
Make sure that messages are not marked as read when going back to the roomlist after entering a room when neochat is thin and only showing a single page
Fixes#642
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.
Make sure that the neochat can handle switching connection when the current one is logged out. This is mostly about using QPointer to handle use after free issues due to room objects being deleted.
Steal the look of itinerary items from itinerary but simplified. Also includes new support for flights and restaurants

This adds previews for downloaded pdfs and code files.


UCHAR_EMOJI_PRESENTATION is replaced with UCHAR_EMOJI, which seems to be more useful for decting emojis.
The lambda is also turned into a proper function as there's no apparent reason for it to be a lambda.
Many URLs we see in the KDE rooms end with a question mark, without a
space. The linkify regex for plain URLs incorrectly considered them as
part of the link, which usually breaks them when opened in a web
browser. Now the regex excludes these, unless they are accompanied by
another character (so links like kde.org/realurl?is=true will still
work.)