Add the option to set powerlevel to userdetaildialog.
This is done by making the powerleveldialog into it's own file and using that.
implements network/neochat#570
- Move the room list drag handler and logic to RoomList.qml.
- Make the compact mode logic not rely on a saved width value from Config as this was causing the room list to have large icons the first launch after a recent update.
- Instead save the compact mode state and initialise the width based upon that.
Remove the global menu and move explore and new chat/room buttons to new `ExploreComponent.qml`.
This is designed to sit in the header of the `RoomListPage` and will only be visible when the room list is. The other settings have just been removed as they are covered by the `UserInfo` component and quick can be done form the decoration or system tray.
When wide\

Collapsed mode\

This feature doesn't work very well at the moment, but that's not an
excuse not to have a keyboard shortcut for it. As usual, it's the same
shortcut as many other chat clients use.
Since commit eee93e0f1, the ChatBar has a conflicting shortcut that
takes precedence even when it doesn't do anything, so that the Escape
shortcut of RoomPage is never actually invoked any more.
Fix this by using Keys.onShortcutOverride() instead in ChatBar and
accepting the event only when it actually cancelled something. So if
you're writing a reply, the first time pressing Escape cancels the reply
and the second one calls the RoomPage shortcut that goes to the
RoomListPage.
This is the same key combination as commonly used by other chat clients
such as Element, Slack and Discord. For consistency, also add the same
Alt+Up/Down shortcut as used in thes other clients as aliases for
switching rooms without considering the unread status.
This is a key combination that doesn't seem to be used either in NeoChat
nor with a common meaning in other chat clients, so let's use it for
switching the user.
This allows to use the room switching shortcuts like Ctrl+PgUp/PgDn even
when the RoomPage doesn't currently have the focus. It's also a nice
code simplification.
If you're on the first visible room and try to switch to the previous
one (or on the last visible room switching to the next one), the first
(or last) room in the list is incorrectly selected even if it's not
currently visible.
Fix this by not first entering each room and then checking whether it is
the one we really wanted, but iterating until we find a room that we
want and only entering it then.