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
This handles the following non-functioning cases from the space saving mr:
- Selecting home or friends
- Switching space that has the same room selected
- When click on a space the space home page is shown, unless the current room is also a member of the new space
- When changing to friends or global the first is entered
- The global now only contains rooms that are not part of a space
- Global is now home
Update the UX to refer to structure direct chats as friends. The direct chats are pulled into their own tab in the space drawer.
The `UserDetailDialog` is also updated to check whether a direct chat already exists and if not ask to invite as friend.
Since this means that the space drawer can no longer be hidden when there are no spaces,
also make it less empty by adding a button for creating new spaces.
More things will come in the future.
BUG: 479051
